This repository contains ALTO schema versions - drafts and final released ones.

All open issues and discussions about changes to the ALTO standard can be found and tracked in the issues repository

Latest official schema version is 4.4.
Primary source for the schema is (http://www.loc.gov/standards/alto/v4/alto-4-4.xsd)
Alternate source for the schema is (https://cdn.rawgit.com/altoxml/schema/master/v4/alto-4-4.xsd)

Summary of proposed changes

• Change schema version to 4.4
• Add LANG attribute on PageType level to describe the default language used in document
• Add ROTATION attribute on PageType level to describe the default rotation used in document
• Add OTHERLANGS attribute on PageType to summarize all the languages present into a particular document
• Adapt "PointsType" documentation
• Adapt xLink attribute group documentation on "BlockType"

Details about the changes of the version and further documentation can be found in the ALTO documentation repository.