Format Changes - Update No. 31, December 2020 (Appendix G: Format Change Lists)
The following documents the changes contained in the thirty-first update to the 1999 edition of 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).
New content designators:
Fields
881 Manifestation Statements (R)
Subfield codes
$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)
$0 Authority record control number or standard number (R) in 384 (Key)
$1 Real World Object URI (R) in 384 (Key)
Obsolete content designators:
Subfield codes
The following subfields were made obsolete in 856 (Electronic Location and Access):
$b Access number (R)
$h Processor of request (NR)
$i Instruction (R)
$j Bits per second (NR)
$k Password (NR)
$l Logon (NR)
$n Name of location of host (NR)
$r Settings (NR)
$t Terminal emulation (R)
Change in content designator name and definition:
Field
345 Projection Characteristics of Moving Image renamed Moving Image Characteristics
Change in repeatability:
Field
043 Geographic Area Code changed to Repeatable (R)
See also: