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METS Version 1.8 Schema is Now Current Version (April 29, 2009)

Version 1.8 of the METS schema moved from "candidate" to "official current version " status today. This version of the schema is now available at both of the following URLS:

http://lcnetdev.github.io/standards/mets/mets.xsd

http://lcnetdev.github.io/standards/mets/version18/mets.xsd

The first, more generic URL always points to the current, official Version 1.x of the mets schema.

Version 1.8 of the METS schema is fully backwards compatible with version 1.7, and includes the following changes and additions:

1. CRC32, Adler-32, and MNP have been added to the enumerated values constraining CHECKSUMTYPE to align with MIX messageDigestAlgorithm constraints.
2. TEXTMD and METSRIGHTS have been added to the enumeration values constraining MDTYPE.
3. An MDTYPEVERSION attribute has been added as a companion to the MDTYPE attribute in the mdRef and mdWrap elements.
4. The ID and STRUCTID attributes on the <behavior> element have been made optional. Depending on whether the behavior applies to a transformFile element or div elements in the structMap, only one or the other of the attributes would pertain.
5. All documentation has been aligned with the METS Primer, and corrected where indicated. (We have not yet, but will, also make all of these documentation corrections in the Primer itself).
6. xml:lang="en" atttribute value has been added to every <documentation> element.
7. xlink:extendedLink support has been added to the <structLink> element by means of a new <smLinkGrp> element, and its child <smLocatorLink> and <smArcLink> elements.

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