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 ALTO XML schema

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: Version 4.0 Primary source Alternate source

Summary of changes

• Changed schema version to 4.0
• Changed namespace and targetNamespace to http://www.loc.gov/standards/alto/ns-v4#
• Clarification and definition of the licensing to common standard "CC BY-SA 4.0" for this ALTO standard (with agreement of the authors)
• Added character based text description with new Glyph element and its subelement Variant (GlyphType, VariantType)
• Extended annotation for clarification of the difference of existing element ALTERNATIVE and Glyph/Variant
• Introduced generic "Processing" and deprecate "OcrProcessing"
• Introduce generic "processingStep" with "ProcessingStepType" and required attribute "ID" and deprecate "preProcessingStep", "ocrProcessingStep", "postProcessingStep"
• Add common vocabulary for "processingStep" comprising the "ContentGeneration", "ContentModification", "PreOperation", "PostOperation", "Other"
• Fix for the element Shape. The Shape element can now only be used once within a PageSpace or a TextLine as it was intended.

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