Appendix F - Format Changes

MARC 21 Authority

June 2025

This section is provided for the lists of format changes that accompany each update to the MARC 21 Format for Authority Data.

MARC 21 FORMAT FOR AUTHORITY DATA

FORMAT CHANGE LIST

Update No. 40, June 2025

This page documents the changes contained in the fortieth update to the 1999 edition of the MARC 21 Format for Authority Data. Update No. 40 (June 2025) includes changes resulting from proposals that were considered by the MARC 21 community since the publication of Update No. 39 (December 2024).

Format changes in previous updates can be found on the MARC Format Overview page.

■ Changes in content designator names and definitions:

Subfield

$b Numeration redescribed in X00 (Personal Names-General Information)

■ Fast-track changes:

Subfields

$7 Access status redescribed in 856 (Electronic Location and Access)

$7 Access status redescribed in 857 (Electronic Archive Location and Access)

UPDATE 40 LOCAL PRINT GUIDE

The following sections and fields were created/changed in Update No. 40 and should be printed to keep a print copy of the format up-to-date. Changes appear in red.