The following documents the changes contained in the twelfth update to the 1999 edition of MARC 21 Format for Authority Data.  Update No. 12 (October 2010) includes changes resulting from proposals that were considered by the MARC 21 community during June 2010.

Change in content designator name and definition:

Subfield code

$0  Record control number changed to Authority record control number or standard number and redefined in Appendix A

See also:

Appendix F:  Format Change Lists