Class: Google::Cloud::DocumentAI::V1::Document

Inherits:

Object

• Object
• Google::Cloud::DocumentAI::V1::Document

Extended by:

Protobuf::MessageExts::ClassMethods

Includes:

Protobuf::MessageExts

Defined in:

proto_docs/google/cloud/documentai/v1/document.rb

Overview

Document represents the canonical document resource in Document AI. It is an interchange format that provides insights into documents and allows for collaboration between users and Document AI to iterate and optimize for quality.

Defined Under Namespace

Classes: ChunkedDocument, DocumentLayout, Entity, EntityRelation, Page, PageAnchor, Provenance, Revision, ShardInfo, Style, TextAnchor, TextChange

Instance Attribute Summary

• #chunked_document ⇒ ::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument

  Document chunked based on chunking config.

• #content ⇒ ::String

  Optional.

• #document_layout ⇒ ::Google::Cloud::DocumentAI::V1::Document::DocumentLayout

  Parsed layout of the document.

• #entities ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>

  A list of entities detected on Document.text.

• #entity_relations ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::EntityRelation>

  Placeholder.

• #error ⇒ ::Google::Rpc::Status

  Any error that occurred while processing this document.

• #mime_type ⇒ ::String

  An IANA published media type (MIME type).

• #pages ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Page>

  Visual page layout for the Document.

• #revisions ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Revision>

  Placeholder.

• #shard_info ⇒ ::Google::Cloud::DocumentAI::V1::Document::ShardInfo

  Information about the sharding if this document is sharded part of a larger document.

• #text ⇒ ::String

  Optional.

• #text_changes ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::TextChange>

  Placeholder.

• #text_styles ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Style> deprecated Deprecated.

  This field is deprecated and may be removed in the next major version update.

• #uri ⇒ ::String

  Optional.

Instance Attribute Details

#chunked_document ⇒ ::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument

Returns Document chunked based on chunking config.

Returns:

• (::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument) —

  Document chunked based on chunking config.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#content ⇒ ::String

Returns Optional. Inline document content, represented as a stream of bytes. Note: As with all bytes fields, protobuffers use a pure binary representation, whereas JSON representations use base64.

Returns:

• (::String) —

  Optional. Inline document content, represented as a stream of bytes. Note: As with all bytes fields, protobuffers use a pure binary representation, whereas JSON representations use base64.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#document_layout ⇒ ::Google::Cloud::DocumentAI::V1::Document::DocumentLayout

Returns Parsed layout of the document.

Returns:

• (::Google::Cloud::DocumentAI::V1::Document::DocumentLayout) —

  Parsed layout of the document.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#entities ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>

Returns A list of entities detected on Document.text. For document shards, entities in this list may cross shard boundaries.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>) —

  A list of entities detected on Document.text. For document shards, entities in this list may cross shard boundaries.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#entity_relations ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::EntityRelation>

Returns Placeholder. Relationship among Document.entities.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::EntityRelation>) —

  Placeholder. Relationship among Document.entities.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#error ⇒ ::Google::Rpc::Status

Returns Any error that occurred while processing this document.

Returns:

• (::Google::Rpc::Status) —

  Any error that occurred while processing this document.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#mime_type ⇒ ::String

Returns An IANA published media type (MIME type).

Returns:

• (::String) —

  An IANA published media type (MIME type).

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#pages ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Page>

Returns Visual page layout for the Document.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::Page>) —

  Visual page layout for the Document.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#revisions ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Revision>

Returns Placeholder. Revision history of this document.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::Revision>) —

  Placeholder. Revision history of this document.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#shard_info ⇒ ::Google::Cloud::DocumentAI::V1::Document::ShardInfo

Returns Information about the sharding if this document is sharded part of a larger document. If the document is not sharded, this message is not specified.

Returns:

• (::Google::Cloud::DocumentAI::V1::Document::ShardInfo) —

  Information about the sharding if this document is sharded part of a larger document. If the document is not sharded, this message is not specified.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#text ⇒ ::String

Returns Optional. UTF-8 encoded text in reading order from the document.

Returns:

• (::String) —

  Optional. UTF-8 encoded text in reading order from the document.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#text_changes ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::TextChange>

Returns Placeholder. A list of text corrections made to Document.text. This is usually used for annotating corrections to OCR mistakes. Text changes for a given revision may not overlap with each other.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::TextChange>) —

  Placeholder. A list of text corrections made to Document.text. This is usually used for annotating corrections to OCR mistakes. Text changes for a given revision may not overlap with each other.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#text_styles ⇒ ::Array<::Google::Cloud::DocumentAI::V1::Document::Style>

Deprecated.

This field is deprecated and may be removed in the next major version update.

Returns Styles for the Document.text.

Returns:

• (::Array<::Google::Cloud::DocumentAI::V1::Document::Style>) —

  Styles for the Document.text.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end

#uri ⇒ ::String

Returns Optional. Currently supports Google Cloud Storage URI of the form gs://bucket_name/object_name. Object versioning is not supported. For more information, refer to Google Cloud Storage Request URIs.

Returns:

• (::String) —

  Optional. Currently supports Google Cloud Storage URI of the form gs://bucket_name/object_name. Object versioning is not supported. For more information, refer to Google Cloud Storage Request URIs.

# File 'proto_docs/google/cloud/documentai/v1/document.rb', line 84

class Document
  include ::Google::Protobuf::MessageExts
  extend ::Google::Protobuf::MessageExts::ClassMethods

  # For a large document, sharding may be performed to produce several
  # document shards. Each document shard contains this field to detail which
  # shard it is.
  # @!attribute [rw] shard_index
  #   @return [::Integer]
  #     The 0-based index of this shard.
  # @!attribute [rw] shard_count
  #   @return [::Integer]
  #     Total number of shards.
  # @!attribute [rw] text_offset
  #   @return [::Integer]
  #     The index of the first character in
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text} in the overall
  #     document global text.
  class ShardInfo
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Annotation for common text style attributes. This adheres to CSS
  # conventions as much as possible.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] color
  #   @return [::Google::Type::Color]
  #     Text color.
  # @!attribute [rw] background_color
  #   @return [::Google::Type::Color]
  #     Text background color.
  # @!attribute [rw] font_weight
  #   @return [::String]
  #     [Font weight](https://www.w3schools.com/cssref/pr_font_weight.asp).
  #     Possible values are `normal`, `bold`, `bolder`, and `lighter`.
  # @!attribute [rw] text_style
  #   @return [::String]
  #     [Text style](https://www.w3schools.com/cssref/pr_font_font-style.asp).
  #     Possible values are `normal`, `italic`, and `oblique`.
  # @!attribute [rw] text_decoration
  #   @return [::String]
  #     [Text
  #     decoration](https://www.w3schools.com/cssref/pr_text_text-decoration.asp).
  #     Follows CSS standard. <text-decoration-line> <text-decoration-color>
  #     <text-decoration-style>
  # @!attribute [rw] font_size
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Style::FontSize]
  #     Font size.
  # @!attribute [rw] font_family
  #   @return [::String]
  #     Font family such as `Arial`, `Times New Roman`.
  #     https://www.w3schools.com/cssref/pr_font_font-family.asp
  class Style
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Font size with unit.
    # @!attribute [rw] size
    #   @return [::Float]
    #     Font size for the text.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Unit for the font size. Follows CSS naming (such as `in`, `px`, and
    #     `pt`).
    class FontSize
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # A page in a {::Google::Cloud::DocumentAI::V1::Document Document}.
  # @!attribute [rw] page_number
  #   @return [::Integer]
  #     1-based index for current
  #     {::Google::Cloud::DocumentAI::V1::Document::Page Page} in a parent
  #     {::Google::Cloud::DocumentAI::V1::Document Document}. Useful when a page is
  #     taken out of a {::Google::Cloud::DocumentAI::V1::Document Document} for
  #     individual processing.
  # @!attribute [rw] image
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Image]
  #     Rendered image for this page. This image is preprocessed to remove any
  #     skew, rotation, and distortions such that the annotation bounding boxes
  #     can be upright and axis-aligned.
  # @!attribute [rw] transforms
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Matrix>]
  #     Transformation matrices that were applied to the original document image
  #     to produce {::Google::Cloud::DocumentAI::V1::Document::Page#image Page.image}.
  # @!attribute [rw] dimension
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Dimension]
  #     Physical dimension of the page.
  # @!attribute [rw] layout
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
  #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the page.
  # @!attribute [rw] detected_languages
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
  #     A list of detected languages together with confidence.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Block>]
  #     A list of visually detected text blocks on the page.
  #     A block has a set of lines (collected into paragraphs) that have a common
  #     line-spacing and orientation.
  # @!attribute [rw] paragraphs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph>]
  #     A list of visually detected text paragraphs on the page.
  #     A collection of lines that a human would perceive as a paragraph.
  # @!attribute [rw] lines
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Line>]
  #     A list of visually detected text lines on the page.
  #     A collection of tokens that a human would perceive as a line.
  # @!attribute [rw] tokens
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Token>]
  #     A list of visually detected tokens on the page.
  # @!attribute [rw] visual_elements
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement>]
  #     A list of detected non-text visual elements e.g. checkbox,
  #     signature etc. on the page.
  # @!attribute [rw] tables
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table>]
  #     A list of visually detected tables on the page.
  # @!attribute [rw] form_fields
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::FormField>]
  #     A list of visually detected form fields on the page.
  # @!attribute [rw] symbols
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Symbol>]
  #     A list of visually detected symbols on the page.
  # @!attribute [rw] detected_barcodes
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode>]
  #     A list of detected barcodes.
  # @!attribute [rw] image_quality_scores
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores]
  #     Image quality scores.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     The history of this page.
  class Page
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Dimension for the page.
    # @!attribute [rw] width
    #   @return [::Float]
    #     Page width.
    # @!attribute [rw] height
    #   @return [::Float]
    #     Page height.
    # @!attribute [rw] unit
    #   @return [::String]
    #     Dimension unit.
    class Dimension
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Rendered image contents for this page.
    # @!attribute [rw] content
    #   @return [::String]
    #     Raw byte content of the image.
    # @!attribute [rw] mime_type
    #   @return [::String]
    #     Encoding [media type (MIME
    #     type)](https://www.iana.org/assignments/media-types/media-types.xhtml)
    #     for the image.
    # @!attribute [rw] width
    #   @return [::Integer]
    #     Width of the image in pixels.
    # @!attribute [rw] height
    #   @return [::Integer]
    #     Height of the image in pixels.
    class Image
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Representation for transformation matrix, intended to be compatible and
    # used with OpenCV format for image manipulation.
    # @!attribute [rw] rows
    #   @return [::Integer]
    #     Number of rows in the matrix.
    # @!attribute [rw] cols
    #   @return [::Integer]
    #     Number of columns in the matrix.
    # @!attribute [rw] type
    #   @return [::Integer]
    #     This encodes information about what data type the matrix uses.
    #     For example, 0 (CV_8U) is an unsigned 8-bit image. For the full list
    #     of OpenCV primitive data types, please refer to
    #     https://docs.opencv.org/4.3.0/d1/d1b/group__core__hal__interface.html
    # @!attribute [rw] data
    #   @return [::String]
    #     The matrix data.
    class Matrix
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Visual element describing a layout unit on a page.
    # @!attribute [rw] text_anchor
    #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
    #     Text anchor indexing into the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of the current
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} within
    #     context of the object this layout is for. e.g. confidence can be for a
    #     single token, a table, a visual element, etc. depending on context.
    #     Range `[0, 1]`.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     The bounding polygon for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    # @!attribute [rw] orientation
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout::Orientation]
    #     Detected orientation for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout}.
    class Layout
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected human reading orientation.
      module Orientation
        # Unspecified orientation.
        ORIENTATION_UNSPECIFIED = 0

        # Orientation is aligned with page up.
        PAGE_UP = 1

        # Orientation is aligned with page right.
        # Turn the head 90 degrees clockwise from upright to read.
        PAGE_RIGHT = 2

        # Orientation is aligned with page down.
        # Turn the head 180 degrees from upright to read.
        PAGE_DOWN = 3

        # Orientation is aligned with page left.
        # Turn the head 90 degrees counterclockwise from upright to read.
        PAGE_LEFT = 4
      end
    end

    # A block has a set of lines (collected into paragraphs) that have a
    # common line-spacing and orientation.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Block Block}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class Block
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of lines that a human would perceive as a paragraph.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Paragraph Paragraph}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Paragraph
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A collection of tokens that a human would perceive as a line.
    # Does not cross column boundaries, can be horizontal, vertical, etc.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Line Line}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The  history of this annotation.
    class Line
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected token.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_break
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak]
    #     Detected break at the end of a
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    # @!attribute [rw] style_info
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo]
    #     Text style attributes.
    class Token
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Detected break at the end of a
      # {::Google::Cloud::DocumentAI::V1::Document::Page::Token Token}.
      # @!attribute [rw] type
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Token::DetectedBreak::Type]
      #     Detected break type.
      class DetectedBreak
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods

        # Enum to denote the type of break found.
        module Type
          # Unspecified break type.
          TYPE_UNSPECIFIED = 0

          # A single whitespace.
          SPACE = 1

          # A wider whitespace.
          WIDE_SPACE = 2

          # A hyphen that indicates that a token has been split across lines.
          HYPHEN = 3
        end
      end

      # Font and other text style attributes.
      # @!attribute [rw] font_size
      #   @return [::Integer]
      #     Font size in points (`1` point is `¹⁄₇₂` inches).
      # @!attribute [rw] pixel_font_size
      #   @return [::Float]
      #     Font size in pixels, equal to _unrounded
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_size font_size}_
      #     * _resolution_ ÷ `72.0`.
      # @!attribute [rw] letter_spacing
      #   @return [::Float]
      #     Letter spacing in points.
      # @!attribute [rw] font_type
      #   @return [::String]
      #     Name or style of the font.
      # @!attribute [rw] bold
      #   @return [::Boolean]
      #     Whether the text is bold (equivalent to
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Token::StyleInfo#font_weight font_weight}
      #     is at least `700`).
      # @!attribute [rw] italic
      #   @return [::Boolean]
      #     Whether the text is italic.
      # @!attribute [rw] underlined
      #   @return [::Boolean]
      #     Whether the text is underlined.
      # @!attribute [rw] strikeout
      #   @return [::Boolean]
      #     Whether the text is strikethrough. This feature is not supported yet.
      # @!attribute [rw] subscript
      #   @return [::Boolean]
      #     Whether the text is a subscript. This feature is not supported yet.
      # @!attribute [rw] superscript
      #   @return [::Boolean]
      #     Whether the text is a superscript. This feature is not supported yet.
      # @!attribute [rw] smallcaps
      #   @return [::Boolean]
      #     Whether the text is in small caps. This feature is not supported yet.
      # @!attribute [rw] font_weight
      #   @return [::Integer]
      #     TrueType weight on a scale `100` (thin) to `1000` (ultra-heavy).
      #     Normal is `400`, bold is `700`.
      # @!attribute [rw] handwritten
      #   @return [::Boolean]
      #     Whether the text is handwritten.
      # @!attribute [rw] text_color
      #   @return [::Google::Type::Color]
      #     Color of the text.
      # @!attribute [rw] background_color
      #   @return [::Google::Type::Color]
      #     Color of the background.
      class StyleInfo
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A detected symbol.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Symbol Symbol}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class Symbol
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected non-text visual elements e.g. checkbox, signature etc. on the
    # page.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] type
    #   @return [::String]
    #     Type of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::VisualElement VisualElement}.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    class VisualElement
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A table representation similar to HTML table structure.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table Table}.
    # @!attribute [rw] header_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Header rows of the table.
    # @!attribute [rw] body_rows
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableRow>]
    #     Body rows of the table.
    # @!attribute [rw] detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages together with confidence.
    # @!attribute [rw] provenance
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this table.
    class Table
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # A row of table cells.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell>]
      #     Cells that make up this row.
      class TableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # A cell representation inside the table.
      # @!attribute [rw] layout
      #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
      #     {::Google::Cloud::DocumentAI::V1::Document::Page::Table::TableCell TableCell}.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      # @!attribute [rw] detected_languages
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
      #     A list of detected languages together with confidence.
      class TableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end

    # A form field detected on the page.
    # @!attribute [rw] field_name
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} name.
    #     e.g. `Address`, `Email`, `Grand total`, `Phone number`, etc.
    # @!attribute [rw] field_value
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::FormField FormField} value.
    # @!attribute [rw] name_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for name together with confidence.
    # @!attribute [rw] value_detected_languages
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::DetectedLanguage>]
    #     A list of detected languages for value together with confidence.
    # @!attribute [rw] value_type
    #   @return [::String]
    #     If the value is non-textual, this field represents the type. Current
    #     valid values are:
    #
    #     - blank (this indicates the `field_value` is normal text)
    #     - `unfilled_checkbox`
    #     - `filled_checkbox`
    # @!attribute [rw] corrected_key_text
    #   @return [::String]
    #     Created for Labeling UI to export key text.
    #     If corrections were made to the text identified by the
    #     `field_name.text_anchor`, this field will contain the correction.
    # @!attribute [rw] corrected_value_text
    #   @return [::String]
    #     Created for Labeling UI to export value text.
    #     If corrections were made to the text identified by the
    #     `field_value.text_anchor`, this field will contain the correction.
    # @!attribute [rw] provenance
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
    #     The history of this annotation.
    class FormField
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # A detected barcode.
    # @!attribute [rw] layout
    #   @return [::Google::Cloud::DocumentAI::V1::Document::Page::Layout]
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::Layout Layout} for
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    # @!attribute [rw] barcode
    #   @return [::Google::Cloud::DocumentAI::V1::Barcode]
    #     Detailed barcode information of the
    #     {::Google::Cloud::DocumentAI::V1::Document::Page::DetectedBarcode DetectedBarcode}.
    class DetectedBarcode
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Detected language for a structural component.
    # @!attribute [rw] language_code
    #   @return [::String]
    #     The [BCP-47 language
    #     code](https://www.unicode.org/reports/tr35/#Unicode_locale_identifier),
    #     such as `en-US` or `sr-Latn`.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Confidence of detected language. Range `[0, 1]`.
    class DetectedLanguage
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # Image quality scores for the page image.
    # @!attribute [rw] quality_score
    #   @return [::Float]
    #     The overall quality score. Range `[0, 1]` where `1` is perfect quality.
    # @!attribute [rw] detected_defects
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Page::ImageQualityScores::DetectedDefect>]
    #     A list of detected defects.
    class ImageQualityScores
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Image Quality Defects
      # @!attribute [rw] type
      #   @return [::String]
      #     Name of the defect type. Supported values are:
      #
      #     - `quality/defect_blurry`
      #     - `quality/defect_noisy`
      #     - `quality/defect_dark`
      #     - `quality/defect_faint`
      #     - `quality/defect_text_too_small`
      #     - `quality/defect_document_cutoff`
      #     - `quality/defect_text_cutoff`
      #     - `quality/defect_glare`
      # @!attribute [rw] confidence
      #   @return [::Float]
      #     Confidence of detected defect. Range `[0, 1]` where `1` indicates
      #     strong confidence that the defect exists.
      class DetectedDefect
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # An entity that could be a phrase in the text or a property that belongs to
  # the document. It is a known entity type, such as a person, an organization,
  # or location.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Optional. Provenance of the entity.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] type
  #   @return [::String]
  #     Required. Entity type from a schema e.g. `Address`.
  # @!attribute [rw] mention_text
  #   @return [::String]
  #     Optional. Text value of the entity e.g. `1600 Amphitheatre Pkwy`.
  # @!attribute [rw] mention_id
  #   @return [::String]
  #     Optional. Deprecated.  Use `id` field instead.
  # @!attribute [rw] confidence
  #   @return [::Float]
  #     Optional. Confidence of detected Schema entity. Range `[0, 1]`.
  # @!attribute [rw] page_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor]
  #     Optional. Represents the provenance of this entity wrt. the location on
  #     the page where it was found.
  # @!attribute [rw] id
  #   @return [::String]
  #     Optional. Canonical id. This will be a unique value in the entity list
  #     for this document.
  # @!attribute [rw] normalized_value
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Entity::NormalizedValue]
  #     Optional. Normalized entity value. Absent if the extracted value could
  #     not be converted or the type (e.g. address) is not supported for certain
  #     parsers. This field is also only populated for certain supported document
  #     types.
  # @!attribute [rw] properties
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Entity>]
  #     Optional. Entities can be nested to form a hierarchical data structure
  #     representing the content in the document.
  # @!attribute [rw] provenance
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance]
  #     Optional. The history of this annotation.
  # @!attribute [rw] redacted
  #   @return [::Boolean]
  #     Optional. Whether the entity will be redacted for de-identification
  #     purposes.
  class Entity
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Parsed and normalized entity value.
    # @!attribute [rw] money_value
    #   @return [::Google::Type::Money]
    #     Money value. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/money.proto
    # @!attribute [rw] date_value
    #   @return [::Google::Type::Date]
    #     Date value. Includes year, month, day. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/date.proto
    # @!attribute [rw] datetime_value
    #   @return [::Google::Type::DateTime]
    #     DateTime value. Includes date, time, and timezone. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/datetime.proto
    # @!attribute [rw] address_value
    #   @return [::Google::Type::PostalAddress]
    #     Postal address. See also:
    #     https://github.com/googleapis/googleapis/blob/master/google/type/postal_address.proto
    # @!attribute [rw] boolean_value
    #   @return [::Boolean]
    #     Boolean value. Can be used for entities with binary values, or for
    #     checkboxes.
    # @!attribute [rw] integer_value
    #   @return [::Integer]
    #     Integer value.
    # @!attribute [rw] float_value
    #   @return [::Float]
    #     Float value.
    # @!attribute [rw] text
    #   @return [::String]
    #     Optional. An optional field to store a normalized string.
    #     For some entity types, one of respective `structured_value` fields may
    #     also be populated. Also not all the types of `structured_value` will be
    #     normalized. For example, some processors may not generate `float`
    #     or `integer` normalized text by default.
    #
    #     Below are sample formats mapped to structured values.
    #
    #     - Money/Currency type (`money_value`) is in the ISO 4217 text format.
    #     - Date type (`date_value`) is in the ISO 8601 text format.
    #     - Datetime type (`datetime_value`) is in the ISO 8601 text format.
    class NormalizedValue
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Relationship between
  # {::Google::Cloud::DocumentAI::V1::Document::Entity Entities}.
  # @!attribute [rw] subject_id
  #   @return [::String]
  #     Subject entity id.
  # @!attribute [rw] object_id
  #   @return [::String]
  #     Object entity id.
  # @!attribute [rw] relation
  #   @return [::String]
  #     Relationship description.
  class EntityRelation
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Text reference indexing into the
  # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] text_segments
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment>]
  #     The text segments from the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
  # @!attribute [rw] content
  #   @return [::String]
  #     Contains the content of the text span so that users do
  #     not have to look it up in the text_segments.  It is always
  #     populated for formFields.
  class TextAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # A text segment in the
    # {::Google::Cloud::DocumentAI::V1::Document#text Document.text}. The indices
    # may be out of bounds which indicate that the text extends into another
    # document shard for large sharded documents. See
    # {::Google::Cloud::DocumentAI::V1::Document::ShardInfo#text_offset ShardInfo.text_offset}
    # @!attribute [rw] start_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     start UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    # @!attribute [rw] end_index
    #   @return [::Integer]
    #     {::Google::Cloud::DocumentAI::V1::Document::TextAnchor::TextSegment TextSegment}
    #     half open end UTF-8 char index in the
    #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.
    class TextSegment
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # Referencing the visual context of the entity in the
  # {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages}. Page anchors
  # can be cross-page, consist of multiple bounding polygons and optionally
  # reference specific layout element types.
  # @!attribute [rw] page_refs
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef>]
  #     One or more references to visual page elements
  class PageAnchor
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a weak reference to a page element within a document.
    # @!attribute [rw] page
    #   @return [::Integer]
    #     Required. Index into the
    #     {::Google::Cloud::DocumentAI::V1::Document#pages Document.pages} element,
    #     for example using
    #     `[Document.pages][page_refs.page]` to locate the related page element.
    #     This field is skipped when its value is the default `0`. See
    #     https://developers.google.com/protocol-buffers/docs/proto3#json.
    # @!attribute [rw] layout_type
    #   @return [::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef::LayoutType]
    #     Optional. The type of the layout element that is being referenced if
    #     any.
    # @!attribute [rw] layout_id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::String]
    #     Optional. Deprecated.  Use
    #     {::Google::Cloud::DocumentAI::V1::Document::PageAnchor::PageRef#bounding_poly PageRef.bounding_poly}
    #     instead.
    # @!attribute [rw] bounding_poly
    #   @return [::Google::Cloud::DocumentAI::V1::BoundingPoly]
    #     Optional. Identifies the bounding polygon of a layout element on the
    #     page. If `layout_type` is set, the bounding polygon must be exactly the
    #     same to the layout element it's referring to.
    # @!attribute [rw] confidence
    #   @return [::Float]
    #     Optional. Confidence of detected page element, if applicable. Range
    #     `[0, 1]`.
    class PageRef
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # The type of layout that is being referenced.
      module LayoutType
        # Layout Unspecified.
        LAYOUT_TYPE_UNSPECIFIED = 0

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#blocks Page.blocks}
        # element.
        BLOCK = 1

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#paragraphs Page.paragraphs}
        # element.
        PARAGRAPH = 2

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#lines Page.lines} element.
        LINE = 3

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tokens Page.tokens}
        # element.
        TOKEN = 4

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#visual_elements Page.visual_elements}
        # element.
        VISUAL_ELEMENT = 5

        # Refrrences a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#tables Page.tables}
        # element.
        TABLE = 6

        # References a
        # {::Google::Cloud::DocumentAI::V1::Document::Page#form_fields Page.form_fields}
        # element.
        FORM_FIELD = 7
      end
    end
  end

  # Structure to identify provenance relationships between annotations in
  # different revisions.
  # @!attribute [rw] revision
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The index of the revision that produced this element.
  # @!attribute [rw] id
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Integer]
  #     The Id of this operation.  Needs to be unique within the scope of the
  #     revision.
  # @!attribute [rw] parents
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance::Parent>]
  #     References to the original elements that are replaced.
  # @!attribute [rw] type
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Provenance::OperationType]
  #     The type of provenance operation.
  class Provenance
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # The parent element the current element is based on. Used for
    # referencing/aligning, removal and replacement operations.
    # @!attribute [rw] revision
    #   @return [::Integer]
    #     The index of the index into current revision's parent_ids list.
    # @!attribute [rw] index
    #   @return [::Integer]
    #     The index of the parent item in the corresponding item list (eg. list
    #     of entities, properties within entities, etc.) in the parent revision.
    # @!attribute [rw] id
    #   @deprecated This field is deprecated and may be removed in the next major version update.
    #   @return [::Integer]
    #     The id of the parent provenance.
    class Parent
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end

    # If a processor or agent does an explicit operation on existing elements.
    module OperationType
      # Operation type unspecified. If no operation is specified a provenance
      # entry is simply used to match against a `parent`.
      OPERATION_TYPE_UNSPECIFIED = 0

      # Add an element.
      ADD = 1

      # Remove an element identified by `parent`.
      REMOVE = 2

      # Updates any fields within the given provenance scope of the message. It
      # overwrites the fields rather than replacing them.  Use this when you
      # want to update a field value of an entity without also updating all the
      # child properties.
      UPDATE = 7

      # Currently unused. Replace an element identified by `parent`.
      REPLACE = 3

      # Deprecated. Request human review for the element identified by
      # `parent`.
      EVAL_REQUESTED = 4

      # Deprecated. Element is reviewed and approved at human review,
      # confidence will be set to 1.0.
      EVAL_APPROVED = 5

      # Deprecated. Element is skipped in the validation process.
      EVAL_SKIPPED = 6
    end
  end

  # Contains past or forward revisions of this document.
  # @!attribute [rw] agent
  #   @return [::String]
  #     If the change was made by a person specify the name or id of that
  #     person.
  # @!attribute [rw] processor
  #   @return [::String]
  #     If the annotation was made by processor identify the processor by its
  #     resource name.
  # @!attribute [rw] id
  #   @return [::String]
  #     Id of the revision, internally generated by doc proto storage.
  #     Unique within the context of the document.
  # @!attribute [rw] parent
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Integer>]
  #     The revisions that this revision is based on.  This can include one or
  #     more parent (when documents are merged.)  This field represents the
  #     index into the `revisions` field.
  # @!attribute [rw] parent_ids
  #   @return [::Array<::String>]
  #     The revisions that this revision is based on. Must include all the ids
  #     that have anything to do with this revision - eg. there are
  #     `provenance.parent.revision` fields that index into this field.
  # @!attribute [rw] create_time
  #   @return [::Google::Protobuf::Timestamp]
  #     The time that the revision was created, internally generated by
  #     doc proto storage at the time of create.
  # @!attribute [rw] human_review
  #   @return [::Google::Cloud::DocumentAI::V1::Document::Revision::HumanReview]
  #     Human Review information of this revision.
  class Revision
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Human Review information of the document.
    # @!attribute [rw] state
    #   @return [::String]
    #     Human review state. e.g. `requested`, `succeeded`, `rejected`.
    # @!attribute [rw] state_message
    #   @return [::String]
    #     A message providing more details about the current state of processing.
    #     For example, the rejection reason when the state is `rejected`.
    class HumanReview
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods
    end
  end

  # This message is used for text changes aka. OCR corrections.
  # @!attribute [rw] text_anchor
  #   @return [::Google::Cloud::DocumentAI::V1::Document::TextAnchor]
  #     Provenance of the correction.
  #     Text anchor indexing into the
  #     {::Google::Cloud::DocumentAI::V1::Document#text Document.text}.  There can
  #     only be a single `TextAnchor.text_segments` element.  If the start and
  #     end index of the text segment are the same, the text change is inserted
  #     before that index.
  # @!attribute [rw] changed_text
  #   @return [::String]
  #     The text that replaces the text identified in the `text_anchor`.
  # @!attribute [rw] provenance
  #   @deprecated This field is deprecated and may be removed in the next major version update.
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::Provenance>]
  #     The history of this annotation.
  class TextChange
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods
  end

  # Represents the parsed layout of a document as a collection of blocks that
  # the document is divided into.
  # @!attribute [rw] blocks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
  #     List of blocks in the document.
  class DocumentLayout
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a block. A block could be one of the various types (text,
    # table, list) supported.
    # @!attribute [rw] text_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTextBlock]
    #     Block consisting of text content.
    # @!attribute [rw] table_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableBlock]
    #     Block consisting of table content/structure.
    # @!attribute [rw] list_block
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListBlock]
    #     Block consisting of list content/structure.
    # @!attribute [rw] block_id
    #   @return [::String]
    #     ID of the block.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutPageSpan]
    #     Page span of the block.
    class DocumentLayoutBlock
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the block starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where block starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where block ends in the document.
      class LayoutPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a text type block.
      # @!attribute [rw] text
      #   @return [::String]
      #     Text content stored in the block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the text in the block. Available options are: `paragraph`,
      #     `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
      #     `heading-5`, `header`, `footer`.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A text block could further have child blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutTextBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a table type block.
      # @!attribute [rw] header_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Header rows at the top of the table.
      # @!attribute [rw] body_rows
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableRow>]
      #     Body rows containing main table content.
      # @!attribute [rw] caption
      #   @return [::String]
      #     Table caption/title.
      class LayoutTableBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a row in a table.
      # @!attribute [rw] cells
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutTableCell>]
      #     A table row is a list of table cells.
      class LayoutTableRow
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a cell in a table row.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A table cell is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      # @!attribute [rw] row_span
      #   @return [::Integer]
      #     How many rows this cell spans.
      # @!attribute [rw] col_span
      #   @return [::Integer]
      #     How many columns this cell spans.
      class LayoutTableCell
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents a list type block.
      # @!attribute [rw] list_entries
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock::LayoutListEntry>]
      #     List entries that constitute a list block.
      # @!attribute [rw] type
      #   @return [::String]
      #     Type of the list_entries (if exist). Available options are `ordered`
      #     and `unordered`.
      class LayoutListBlock
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents an entry in the list.
      # @!attribute [rw] blocks
      #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::DocumentLayout::DocumentLayoutBlock>]
      #     A list entry is a list of blocks.
      #     Repeated blocks support further hierarchies and nested blocks.
      class LayoutListEntry
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end

  # Represents the chunks that the document is divided into.
  # @!attribute [rw] chunks
  #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk>]
  #     List of chunks.
  class ChunkedDocument
    include ::Google::Protobuf::MessageExts
    extend ::Google::Protobuf::MessageExts::ClassMethods

    # Represents a chunk.
    # @!attribute [rw] chunk_id
    #   @return [::String]
    #     ID of the chunk.
    # @!attribute [rw] source_block_ids
    #   @return [::Array<::String>]
    #     Unused.
    # @!attribute [rw] content
    #   @return [::String]
    #     Text content of the chunk.
    # @!attribute [rw] page_span
    #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
    #     Page span of the chunk.
    # @!attribute [rw] page_headers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageHeader>]
    #     Page headers associated with the chunk.
    # @!attribute [rw] page_footers
    #   @return [::Array<::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageFooter>]
    #     Page footers associated with the chunk.
    class Chunk
      include ::Google::Protobuf::MessageExts
      extend ::Google::Protobuf::MessageExts::ClassMethods

      # Represents where the chunk starts and ends in the document.
      # @!attribute [rw] page_start
      #   @return [::Integer]
      #     Page where chunk starts in the document.
      # @!attribute [rw] page_end
      #   @return [::Integer]
      #     Page where chunk ends in the document.
      class ChunkPageSpan
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page header associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Header in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the header.
      class ChunkPageHeader
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end

      # Represents the page footer associated with the chunk.
      # @!attribute [rw] text
      #   @return [::String]
      #     Footer in text format.
      # @!attribute [rw] page_span
      #   @return [::Google::Cloud::DocumentAI::V1::Document::ChunkedDocument::Chunk::ChunkPageSpan]
      #     Page span of the footer.
      class ChunkPageFooter
        include ::Google::Protobuf::MessageExts
        extend ::Google::Protobuf::MessageExts::ClassMethods
      end
    end
  end
end