The following documents the changes contained in the twenty-first update to the 1999 edition of MARC 21 Format for Bibliographic Data.  Update No. 21 (September 2015) includes changes resulting from proposals that were considered by the MARC 21 community during June 2015.

New content designators:

Field

348  Format of Notated Music  (R)

Subfield codes

$0  Authority record control number or standard number (R) in 336 (Content Type)

$0  Authority record control number or standard number (R) in 337 (Media Type)

$0  Authority record control number or standard number (R) in 338 (Carrier Type)

The following fields did not have technical changes but contain editorial modifications:

Fields

344  Sound Characteristics

345  Projection Characteristics of Moving Image

346  Video Characteristics

347  Digital File Characteristics

See also:

Appendix G:  Format Change Lists

Appendices