v4.3 Changes

Summary of changes for version 4.3

• Change schema version to 4.3
• Add BASEDIRECTION attribute defining base direction and line orientation to TextLine and BlockType.
• Add support for explicit reading order definitions with "ReadingOrder" element containing "UnorderedGroup"s, "OrderedGroup"s, and "ElementRef"s

Version 4.3 was released in June 2022.

You can find the version 4.3 schema here.

Comments about the schema and its documentation as well as additional use cases for the new schema features are encouraged (GitHub account required).

ALTO schemas will be updated by whole numbers upon making changes that break backward compatibility (version 1 to version 2), and decimals for changes that will not (4.0 to 4.1). The namespace itself will also only change on major versions (ns-v2 to ns-v3).