Appendix G - Format Changes
MARC 21 Bibliographic
December 2020
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. 31, December 2020
This page documents the changes contained in the thirty-first
update to the 1999 edition of the MARC 21 Format for
Bibliographic Data. Update No. 31 (December 2020)
includes changes resulting from proposals that were
considered by the MARC 21 community since the publication of Update No. 30 (May 2020).
UPDATE 31 CHANGES
■ New content designators:
Fields
335Extension Plan (R)
881Manifestation Statements (R)
Subfields
$c Aspect ratio value (R) in 345 (Moving Image Characteristics)
$d Aspect ratio designator (R) in 345 (Moving Image Characteristics)
$p Illustrative content (R) in 340 (Physical Medium)
■ Obsolete content designators:
Subfields
The following subfields were made obsolete in field 856 (Electronic Location and Access):
$bAccess number (R)
$hProcessor of Request (NR)
$i Instruction (R)
$j Bits per second (NR)
$kPassword (NR)
$l Logon (NR)
$nName of location of host (NR)
$rSettings (NR)
$tTerminal emulation (R)
■ Changes in content designator
names and definitions:
Fields
345Projection Characteristics of Moving Image renamed Moving Image Characteristics
■ Fast-track changes:
Field
043Geographic Area Code changed to repeatable
New Subfields
$0 Authority record control number or standard number (R) in 384 (Key)
$1 Real World Object URI (R) in 384 (Key)