Update No. 23 (November 2016) 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 in June 2016.

The changes are indicated in red. Each format also has an appendix,"Format
Changes for Update No. 23 (November 2016)" 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 23. Users are not expected to begin using the new
features in the format until 60 days from the date of this
announcement: November 17, 2016. 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.

PLEASE NOTE: Users may need to refresh pages on their browsers to see the

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