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is an XML Schema that details technical metadata for describing the layout and content of physical text resources, such as pages of a book or a newspaper. It most commonly serves as an extension schema used with the Metadata Encoding and Transmission Schema (METS) Schema. However, ALTO instances can also exist as a standalone document used independently of METS.
Latest official schema version 3.1 (Januari 2016)
- Primary http://www.loc.gov/standards/alto/v3/alto-3-1.xsd
- Alternate https://raw.githubusercontent.com/altoxml/schema/master/v3/alto-3-1.xsd
- [Summary of changes] (https://github.com/altoxml/documentation/wiki/v3.1-Changes)
- [Leave a comment about v3.1 schema] (https://github.com/altoxml/schema/issues/new) - Requires GitHub account
Previous official schema version 3.0
- Primary http://www.loc.gov/standards/alto/v3/alto-3-0.xsd
- Alternate https://raw.githubusercontent.com/altoxml/schema/master/v3/alto-3-0.xsd
- [Summary of changes] (https://github.com/altoxml/documentation/wiki/v3.0-Changes)
- [Leave a comment about v3.0 schema] (https://github.com/altoxml/schema/issues/new) - Requires GitHub account
Earlier schema version 2.1
- Primary http://www.loc.gov/standards/alto/v2/alto-2-1.xsd
- Alternate https://raw2.github.com/altoxml/schema/master/v2/alto-2-1.xsd
- [Summary of Changes for v2.1] (https://github.com/altoxml/documentation/wiki/v2.1-Changes)
Technical Documentation - Technical documentation, guidance and best practises
Reference samples - ALTO XML files with corresponding image files.
Software - Software for creating, presenting and editing ALTO files
Implementers - List of organisations using ALTO in digitised content