It has been brought to our attention that there is still a need for the Audio Technical Metadata Schema (AMD) and the Video Technical Metadata Schema (VMD) for format-specific technical metadata. These were originally prepared as part of the Library of Congress' Audiovisual Prototyping Project (see: in 2002. Since then there has been a lot of work done on more granular, up-to-date technical metadata schemas for audio and video (e.g. AES, MXF), although some of this work is not quite completed or widely implemented in the METS community. There are still a number of METS profiles that use AMD and VMD schemas as METS extension schemas (and in fact a message went out today to the METS list about the MuseiDItalia METS Profile, which uses them).  


The Swedish National Archives, which also uses them, detected some errors in the AMD and VMD schemas, and Karin Bredenberg offered to do a minor revision. In addition to correcting these errors, she harmonized some of the element names with those in PREMIS where equivalent elements existed (as was done with in the NISO standard for digital still images in the most recent version). We have made these draft revised schemas available for comment on the PREMIS site.  We realize that something better may replace these soon, but in the meantime it seemed desirable to make these fairly minor changes.  Note that the PREMIS Data Dictionary version 2.0 defined an extension element for format-specific object characteristics (objectCharacteristicsExtension) and the guidelines for using PREMIS in METS ( suggests using this for format-specific technical metadata schemas (although they may also be used directly in techMD as METS extensions).


We would like to start a comment period for about a month.  The changes are summarized at the top of the schema in the revision section. The schemas are available at:




Please send comments to the METS or PIG lists or directly to me.


Thanks to Karin Bredenberg for her revisions.


Rebecca S. Guenther

Senior Networking & Standards Specialist

Network Development & MARC Standards Office

Library of Congress

101 Independence Ave SE

Washington, DC 20540

voice: +1.202.707.5092

fax: +1.202.707.0115

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