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New Version 1.5 of METS Schema Released (December 6, 2005)

A revised version (Version 1.5) of the METS XML schema is now available at the official METS web site at Please note that this revision requires the use of an additional XML schema document defining XLink attributes used in the METS schema. The XLink schema is available at

This revision makes a number of changes and enhancements to the METS schema, including:

  • The <file> element was made recursive to accomodate the PREMIS Onion Layer model and support XFDU-type unpacking specification.
  • Added <stream> element beneath <file> to allow linking of metadata to subfile structures.
  • Modified structLink TO and FROM attributes to put them in XLink namespace.
  • Made processContents "lax" for all xsd:any elements.

Input from the library community regarding the design of the METS schema is encouraged. Comments regarding METS' design should be submitted to the METS listserv. Details about subscribing to the listserv are available at the METS web site.

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  February 9, 2016

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