Changelog (pagecontent)

Version 2019-07-15

Added TextStyle to Page element (default text style for whole page)
Added "orientation" float attribute to Page element (skew for the whole page)
Added underlineStyle attribute to TextStyleType (valid values: singleLine, doubleLine, other)

Added MapRegion and CustomRegion
New confidence attribute ("conf") for Page, Coords (polygons), BaseLine, ReadingOrder, and AlternativeImage (value 0..1, confidence of algorithm that produced the object)
New "header" boolean attribute for TableCellRole (is the cell a column or row header?)
New "index" int attribute for TextLine (Position (order number) of the text line within its parent text region)
New "imageXResolution", "imageYResolution", "imageResolutionUnit" attributes for Page
New element "MetadataItem" for Metadata (for extended metadata)
- "type" string attribute (optional, one of: author, imageProperties, processingStep, other)
- "name" string attribute (optional)
- "value" string attribute (required)
- "date" dateTime (e.g. 2002-05-30T09:00:00) (optional)
New "Grid" element for TableRegion (visible or virtual table grid / separators)
- "GridPoints" sub element (one row in the points matrix)
Changed RelationType: Instead of 2 RegionRef sub elements there is now SourceRegionRef and TargetRegionRef. Added "id" attribute (required)
Added feature for semantic labels / tags for: MetadataItem, Page, regions, textlines, words, glyphs, reading order groups, Relation
- Labels element - groups labels from the same model
- Label element - the actual label
Added "AlternativeImage" as optional child element to Region, TextLine, Word, and Glyph. External image for the respective object.

Added Graphemes (New level below glyphs for compound characters)
Added User-defined attributes for Page, Metadata, regions, text lines, words, glyphs, reading order groups
Added concept of region role (roles that nested regions take on in context of a parent region; e.g. TableCellRole)
Extended text type constraint to include "list-label"
New attributes for reading order groups (type, custom, comments, regionRef)
New boolean attribute "continuation" for regions and reading order groups, indicating that an object is the continuation of another object in the previous column or page, for example
New string attributes "textColourRgb" and "bgColourRgb" for TextStyle elements. Alternative to named colours. Format is RGB encoded (red value) + (256 x green value) + (65536 x blue value).