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

050 (Library of Congress Call Number)

052 (Geographic Classification)

053 (LC Classification Number)

055 (Library and Archives Canada Call Number)

060 (National Library of Medicine Call Number)

065 (Other Classification Number)

070 (National Agricultural Library Call Number)

075 (Type of Entity)

080 (Universal Decimal Classification Number)

087 (Government Document Classification Number)

260 (Complex See Reference - Subject)

336 (Content Type)

348 (Format of Notated Music)

360 (Complex See Also Reference - Subject)

368 (Other Attributes of Person or Corporate Body)

370 (Associated Place)

372 (Field of Activity)

373 (Associated Group)

374 (Occupation)

376 (Family Information)

377 (Associated Language)

380 (Form of Work)

381 (Other Distinguishing Characteristics of Work or Expression)

382 (Medium of Performance)

385 (Audience Characteristics)

386 (Creator/Contributor Characteristics)

388 (Time Period of Creation)

500 (See Also From Tracing - Personal Name)

510 (See Also From Tracing - Corporate Name)

511 (See Also From Tracing - Meeting Name)

530 (See Also From Tracing - Uniform Title)

547 (See Also From Tracing - Named Event)

548 (See Also From Tracing - Chronological Term)

550 (See Also From Tracing - Topical Term)

551 (See Also From Tracing - Geographic Name)

555 (See Also From Tracing - Genre/Form Term)

562 (See Also From Tracing - Medium of Performance Term)

580 (See Also From Tracing - General Subdivision)

581 (See Also From Tracing - Geographic Subdivision)

582 (See Also From Tracing - Chronological Subdivision)

585 (See Also From Tracing - Form Subdivision)

672 (Title Related to the Entity)

673 (Title Not Related to the Entity)

700 (Established Heading Linking Entry - Personal Name)

710 (Established Heading Linking Entry - Corporate Name)

711 (Established Heading Linking Entry - Meeting Name)

730 (Established Heading Linking Entry - Uniform Title)

747 (Established Heading Linking Entry - Named Event)

748 (Established Heading Linking Entry - Chronological Term)

750 (Established Heading Linking Entry - Topical Term)

751 (Established Heading Linking Entry - Geographic Name)

755 (Established Heading Linking Entry - Genre/Form Term)

762 (Established Heading Linking Entry - Medium of Performance Term)

780 (Subdivision Linking Entry - General Subdivision)

781 (Subdivision Linking Entry - Geographic Subdivision)

782 (Subdivision Linking Entry - Chronological Subdivision)

785 (Subdivision Linking Entry - Form Subdivision)

883 (Machine-generated Metadata Provenance)

885 (Matching Information)

Appendix A (Control Subfields)

Changes in content designator names and definitions:

Subfield codes

$d  Date of meeting redefined as Date of meeting or treaty signing and changed to repeatable in:

111 (Heading - Meeting Name)

411 (See From Tracing - Meeting Name)

511 (See Also From Tracing - Meeting Name)

711 (Established Heading Linking Entry - Meeting Name)

$s  Version changed to repeatable in:

100 (Heading - Personal Name)

110 (Heading - Corporate Name)

111 (Heading - Meeting Name)

130 (Heading - Uniform Title)

400 (See From Tracing - Personal Name)

410 (See From Tracing - Corporate Name)

411 (See From Tracing - Meeting Name)

430 (See From Tracing - Uniform Title)

500 (See Also From Tracing - Personal Name)

510 (See Also From Tracing - Corporate Name)

511 (See Also From Tracing - Meeting Name)

530 (See Also From Tracing - Uniform Title)

700 (Established Heading Linking Entry - Personal Name)

710 (Established Heading Linking Entry - Corporate Name)

711 (Established Heading Linking Entry - Meeting Name)

730 (Established Heading Linking Entry - Uniform Title)

See also:

Appendix F:  Format Change Lists

Appendices