The following documents the changes contained in the twenty-first update to the 1999 edition of MARC 21 Format for Authority 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:


348  Format of Notated Music  (R)

Subfield codes

$w  Bibliographic record control number (R) in 670 (Source Data Found)

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

See also:

Appendix F:  Format Change Lists