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ALTO (Analyzed Layout and Text Object)

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 within the Metadata Encoding and Transmission Schema (METS) administrative metadata section. However, ALTO instances can also exist as a standalone document used independently of METS.

Latest official schema v2.0:

• Primary http://www.loc.gov/standards/alto/alto-v2.0.xsd
• Alternate https://raw.github.com/altoxml/schema/master/alto-v2.0.xsd

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