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MARC: News and Announcements (December 1, 2020)

MARC 21 Update No. 31: Full and Concise available online

Network Development and MARC Standards Office
Library of Congress

Update No. 31 (December 2020) is now available on the MARC website ( It is integrated into the documentation for each of the Online Full and Concise formats that are maintained on that site -- the Bibliographic format, Authority format, Holdings format, Classification format, and Community Information format. The documentation includes changes made to the MARC 21 formats resulting from proposals which were considered by the MARC 21 community since the publication of Update No. 30 (May 2020).

The changes are indicated in red. Each format also has an appendix, "Format Changes for Update No. 31 (December 2020)" that lists the changes that comprise the update. The Web version of the formats is the official version and its release is considered the start date for implementation planning for Update 31. Users are not expected to begin using the new features in the format until 60 days from the date of this announcement: December 1, 2020. For more information about format documentation see: //

Users who want a print version of changed fields will be able to print them from the Format web pages (CDS does not sell a print version of the update). The "Format Changes" appendixes noted above incorporate a print guide following the list of changes, to facilitate easy printing.

Users may need to refresh pages on their browsers to see the changes.

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( 12/01/2020 )
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