Page Content - Ground Truth and Storage The timestamp has to be in UTC (Coordinated Universal Time) and not local time. The timestamp has to be in UTC (Coordinated Universal Time) and not local time. External reference of any kind Semantic labels / tags Type of metadata (e.g. author) E.g. imagePhotometricInterpretation E.g. RGB A semantic label / tag Reference to external model / ontology / schema E.g. an RDF resource identifier (to be used as subject or object of an RDF triple) Prefix for all labels (e.g. first part of an URI) Semantic label The label / tag (e.g. 'person'). Can be an RDF resource identifier (e.g. object of an RDF triple). Additional information on the label (e.g. 'YYYY-mm-dd' for a date label). Can be used as predicate of an RDF triple. Alternative document page images (e.g. black-and-white). Order of blocks within the page. Unassigned regions are considered to be in the (virtual) default layer which is to be treated as below any other layers. Default text style Semantic labels / tags Contains the image file name including the file extension. Specifies the width of the image. Specifies the height of the image. Specifies the image resolution in width. Specifies the image resolution in height. Specifies the unit of the resolution information referring to a standardised unit of measurement (pixels per inch, pixels per centimeter or other). For generic use The angle the rectangle encapsulating the page (or its Border) has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). (The rotated image can be further referenced via “AlternativeImage”.) Range: -179.999,180 The type of the page within the document (e.g. cover page). The primary language used in the page (lower-level definitions override the page-level definition). The secondary language used in the page (lower-level definitions override the page-level definition). The primary script used in the page (lower-level definitions override the page-level definition). The secondary script used in the page (lower-level definitions override the page-level definition). The direction in which text within lines should be read (order of words and characters), in addition to “textLineOrder” (lower-level definitions override the page-level definition). The order of text lines within a block, in addition to “readingDirection” (lower-level definitions override the page-level definition). Confidence value for whole page (between 0 and 1) Pure text is represented as a text region. This includes drop capitals, but practically ornate text may be considered as a graphic. The angle the rectangle encapsulating the region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). (The rotated image can be further referenced via “AlternativeImage”.) Range: -179.999,180 The nature of the text in the region The degree of space in points between the lines of text (line spacing) The direction in which text within lines should be read (order of words and characters), in addition to “textLineOrder”. The order of text lines within the block, in addition to “readingDirection”. The angle the baseline of text within the region has to be rotated (relative to the rectangle encapsulating the region) in clockwise direction in order to correct the present skew, in addition to “orientation” (negative values indicate anti-clockwise rotation). Range: -179.999,180 Defines whether a region of text is indented or not Text align The primary language used in the region The secondary language used in the region The primary script used in the region The secondary script used in the region Point list with format "x1,y1 x2,y2 ..." Confidence value (between 0 and 1) Alternative text line images (e.g. black-and-white) Multiple connected points that mark the baseline of the glyphs Semantic labels / tags Overrides primaryLanguage attribute of parent text region The primary script used in the text line The secondary script used in the text line The direction in which text within the line should be read (order of words and characters). Overrides the production attribute of the parent text region For generic use Position (order number) of this text line within the parent text region. Alternative word images (e.g. black-and-white) Semantic labels / tags Overrides primaryLanguage attribute of parent line and/or text region The primary script used in the word The secondary script used in the word The direction in which text within the word should be read (order of characters). Overrides the production attribute of the parent text line and/or text region. For generic use Alternative glyph images (e.g. black-and-white) Container for graphemes, grapheme groups and non-printing characters Semantic labels / tags The script used for the glyph Overrides the production attribute of the parent word / text line / text region. For generic use Text in a "simple" form (ASCII or extended ASCII as mostly used for typing). I.e. no use of special characters for ligatures (should be stored as two separate characters) etc. Correct encoding of the original, always using the corresponding Unicode code point. I.e. ligatures have to be represented as one character etc. Used for sort order in case multiple TextEquivs are defined. The text content with the lowest index should be interpreted as the main text content. OCR confidence value (between 0 and 1) Type of text content (is it free text or a number, for instance). This is only a descriptive attribute, the text type is not checked during XML validation. Refinement for dataType attribute. Can be a regular expression, for instance. An image is considered to be more intricate and complex than a graphic. These can be photos or drawings. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The colour bit depth required for the region The background colour of the region Specifies whether the region also contains text A line drawing is a single colour illustration without solid areas. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The pen (foreground) colour of the region The background colour of the region Specifies whether the region also contains text Regions containing simple graphics, such as a company logo, should be marked as graphic regions. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The type of graphic in the region An approximation of the number of colours used in the region Specifies whether the region also contains text. Tabular data in any form is represented with a table region. Rows and columns may or may not have separator lines; these lines are not separator regions. Table grid (visible or virtual grid lines) The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The number of rows present in the table The number of columns present in the table The colour of the lines used in the region The background colour of the region Specifies the presence of line separators Specifies whether the region also contains text Matrix of grid points defining the table grid on the page. One row in the grid point matrix. Points with x,y coordinates. (note: for a table with n table rows there should be n+1 grid rows) Points with x,y coordinates. The grid row index Regions containing charts or graphs of any type, should be marked as chart regions. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The type of chart in the region An approximation of the number of colours used in the region The background colour of the region Specifies whether the region also contains text Separators are lines that lie between columns and paragraphs and can be used to logically separate different articles from each other. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The colour of the separator Regions containing equations and mathematical symbols should be marked as maths regions. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The background colour of the region Regions containing chemical formulas. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The background colour of the region Regions containing maps. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 Regions containing musical notations. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The background colour of the region Regions containing advertisements. The angle the rectangle encapsulating a region has to be rotated in clockwise direction in order to correct the present skew (negative values indicate anti-clockwise rotation). Range: -179.999,180 The background colour of the region Noise regions are regions where no real data lies, only false data created by artifacts on the document or scanner noise. To be used if the region type cannot be ascertained. Regions containing content that is not covered by the default types (text, graphic, image, line drawing, chart, table, separator, maths, map, music, chem, advert, noise, unknown). Information on the type of content represented by this region Determines the effective area on the paper of a printed page. Its size is equal for all pages of a book (exceptions: titlepage, multipage pictures). It contains all living elements (except marginals) like body type, footnotes, headings, running titles. It does not contain pagenumber (if not part of running title), marginals, signature mark, preview words. Definition of the reading order within the page. To express a reading order between elements they have to be included in an OrderedGroup. Groups may contain further groups. Confidence value (between 0 and 1) Numbered region Position (order number) of this item within the current hierarchy level. Indexed group containing ordered elements Semantic labels / tags Optional link to a parent region of nested regions. The parent region doubles as reading order group. Only the nested regions should be allowed as group members. Position (order number) of this item within the current hierarchy level. Is this group a continuation of another group (from previous column or page, for example)? For generic use Indexed group containing unordered elements Semantic labels / tags Optional link to a parent region of nested regions. The parent region doubles as reading order group. Only the nested regions should be allowed as group members. Position (order number) of this item within the current hierarchy level. Is this group a continuation of another group (from previous column or page, for example)? For generic use Numbered group (contains ordered elements) Semantic labels / tags Optional link to a parent region of nested regions. The parent region doubles as reading order group. Only the nested regions should be allowed as group members. Is this group a continuation of another group (from previous column or page, for example)? For generic use Numbered group (contains unordered elements) Semantic labels / tags Optional link to a parent region of nested regions. The parent region doubles as reading order group. Only the nested regions should be allowed as group members. Is this group a continuation of another group (from previous column or page, for example)? For generic use Border of the actual page (if the scanned image contains parts not belonging to the page). ISO 639.x 2016-07-14 iso15924 2016-07-14 Can be used to express the z-index of overlapping regions. An element with a greater z-index is always in front of another element with lower z-index. Confidence value (between 0 and 1) Point list with format "x1,y1 x2,y2 ..." Container for one-to-one relations between layout objects (for example: DropCap - paragraph, caption - image). One-to-one relation between to layout object. Use 'link' for loose relations and 'join' for strong relations (where something is fragmented for instance). Examples for 'link': caption - image floating - paragraph paragraph - paragraph (when a paragraph is split across columns and the last word of the first paragraph DOES NOT continue in the second paragraph) drop-cap - paragraph (when the drop-cap is a whole word) Examples for 'join': word - word (separated word at the end of a line) drop-cap - paragraph (when the drop-cap is not a whole word) paragraph - paragraph (when a pragraph is split across columns and the last word of the first paragraph DOES continue in the second paragraph) Semantic labels / tags For generic use Text production type Monospace (fixed-pitch, non-proportional) or proportional font. For instance: Arial, Times New Roman. Add more information if necessary (e.g. blackletter, antiqua). Serif or sans-serif typeface. The size of the characters in points. The x-height or corpus size refers to the distance between the baseline and the mean line of lower-case letters in a typeface. The unit is assumed to be pixels. The degree of space (in points) between the characters in a string of text. Text colour in RGB encoded format (red value) + (256 x green value) + (65536 x blue value). Background colour Background colour in RGB encoded format (red value) + (256 x green value) + (65536 x blue value). Specifies whether the colour of the text appears reversed against a background colour. Line style details if "underlined" is TRUE Alternative region images (e.g. black-and-white). Semantic labels / tags Roles the region takes (e.g. in context of a parent region). For generic use Is this region a continuation of another region (in previous column or page, for example)? Confidence value (between 0 and 1) Examples: "123.456", "+1234.456", "-1234.456", "-.456", "-456" Examples: "123.456", "+1234.456", "-1.2344e56", "-.45E-6", "INF", "-INF", "NaN" Examples: "123456", "+00000012", "-1", "-456" Examples: "true", "false", "1", "0" Examples: "2001-10-26", "2001-10-26+02:00", "2001-10-26Z", "2001-10-26+00:00", "-2001-10-26", "-20000-04-01" Examples: "21:32:52", "21:32:52+02:00", "19:32:52Z", "19:32:52+00:00", "21:32:52.12679" Examples: "2001-10-26T21:32:52", "2001-10-26T21:32:52+02:00", "2001-10-26T19:32:52Z", "2001-10-26T19:32:52+00:00", "-2001-10-26T21:32:52", "2001-10-26T21:32:52.12679" Generic text string An XSD type that is not listed or a custom type (use dataTypeDetails attribute). Container for graphemes, grapheme groups and non-printing characters. Base type for graphemes, grapheme groups and non-printing characters. Order index of grapheme, group, or non-printing character within the parent container (graphemes or glyph or grapheme group). Type of character represented by the grapheme, group, or non-printing character element. For generic use For generic use Represents a sub-element of a glyph. Smallest graphical unit that can be assigned a Unicode code point. A glyph component without visual representation but with Unicode code point. Non-visual / non-printing / control character. Part of grapheme container (of glyph) or grapheme sub group. Container for user-defined attributes Structured custom data defined by name, type and value. Cell position in table starting with row 0 Cell position in table starting with column 0 Number of rows the cell spans (optional; default is 1) Number of columns the cell spans (optional; default is 1) Is the cell a column or row header? Data for a region that takes on the role of a table cell within a parent table region.