The following documents the changes contained in the twenty-fifth update to the 2000 edition of the MARC 21 Format for Classification Data.  Update No. 25 (December 2017) includes changes resulting from proposals that were considered by the MARC 21 community during June 2017.

New content designator:

Subfield code

$1  Real World Object URI (R) in:

034 (Coded Cartographic Mathematical Data)

043 (Geographic Area Code)

700 (Index Term - Personal Name)

710 (Index Term - Corporate Name)

711 (Index Term - Meeting Name)

730 (Index Term - Uniform Title)

748 (Index Term - Chronological)

750 (Index Term - Topical)

751 (Index Term - Geographic Name)

754 (Index Term - Faceted Topical Terms)

883 (Machine-generated Metadata Provenance)

Appendix A (Control Subfields)

See also:

Appendix E:  Format Change Lists

Appendices