Appendix G - Format Changes
MARC 21 Bibliographic
December 2025
This section is provided for the lists of format changes
that accompany each update to the MARC 21 Format for
Bibliographic Data.
MARC 21 FORMAT FOR BIBLIOGRAPHIC DATA
FORMAT CHANGE LIST
Update No. 41, December 2025
This page documents the changes contained in the forty-first
update to the 1999 edition of the MARC 21 Format for
Bibliographic Data. Update No. 41 (December 2025)
includes changes resulting from proposals that were
considered by the MARC 21 community since the publication of Update No. 40 (June 2025).
UPDATE 41 CHANGES
■ New content designators:
Subfields
$i Relationship information (R) in 381 (Other Distinguishing Characteristics of Work or Expression)
$z Title statement context note (NR) in 245 (Title Statement)
$4 Relationship (R) in 381 (Other Distinguishing Characteristics of Work or Expression)
■ Changes in content designator
names and definitions:
Subfield
$c Statement of responsibility, etc. redescribed in 245 (Title Statement)
Appendix
■ Fast-track changes:
New Subfields
$6Linkage (NR) in 060 (National Library of Medicine Call Number)
$6Linkage (NR) in 070 (National Agricultural Library Call Number)
New Codes
r - Remote sensing image
in Maps 008/25 (Type of cartographic material) (006/08)
t - 4K Ultra HD Blu-ray
in Videorecording 007/04 (Videorecording format)
Subfields
$d Groove characteristic redescribed in 344 (Sound Characteristics)
$g Conversion date renamed Conversion date/time and redescribed in 884 (Description Conversion Information)
Code
s - Blu-ray disc
redescribed in Videorecording 007/04 (Videorecording format)