The following documents the changes contained in the twentieth update to the 1999 edition of MARC 21 Format for Authority Data.  Update No. 20 (April 2015) includes changes resulting from proposals that were considered by the MARC 21 community during January/February 2015.

New content designators:

Field

884  Description Conversion Information  (R)

Subfield codes

$e  Number of ensembles (R) in 382 (Medium of Performance)

$q  Establishment date (NR) in 046 (Special Coded Dates)

$r  Termination date (NR) in 046 (Special Coded Dates)

Changes in content designator names and definitions:

Subfield codes

$s  Start period redefined in 046 (Special Coded Dates)

$t  End period redefined in 046 (Special Coded Dates)

See also:

Appendix F:  Format Change Lists

Appendices