The ALTO XML Editorial Board is pleased to announce that the ALTO schema version 3.1 is now available for public use. The schema can be found on the website of the The Library of Congress at http://www.loc.gov/standards/alto/v3/alto-3-1.xsd and on Github at https://cdn.rawgit.com/altoxml/schema/master/v3/alto-3-1.xsd.