The following documents the changes contained in the twenty-fourth update to the 1999 edition of MARC 21 Format for Authority Data.  Update No. 24 (May 2017) includes changes resulting from proposals that were considered by the MARC 21 community during January 2017.

New content designators:

Subfield codes

$i  Relationship information (R) in 370 (Associated Place)

$i  Relationship information (R) in 386 (Creator/Contributor Characteristics)

$0  Authority record control number or standard number (R) in 050 (Library of Congress Call Number)

$0  Authority record control number or standard number (R) in 052 (Geographic Classification)

$0  Authority record control number or standard number (R) in 053 (LC Classification Number)

$0  Authority record control number or standard number (R) in 055 (Library and Archives Canada Call Number)

$0  Authority record control number or standard number (R) in 060 (National Library of Medicine Call Number)

$0  Authority record control number or standard number (R) in 065 (Other Classification Number)

$0  Authority record control number or standard number (R) in 070 (National Agricultural Library Call Number)

$0  Authority record control number or standard number (R) in 080 (Universal Decimal Classification Number)

$0  Authority record control number or standard number (R) in 087 (Government Document Classification Number)

$3  Materials specified (NR) in 370 (Associated Place)

$4  Relationship (R) in 370 (Associated Place)

$4  Relationship (R) in 386 (Creator/Contributor Characteristics)

Changes in content designator names and definitions:

Subfield codes

$g  Place of origin of work renamed Place of origin of work or expression and redescribed in 370 (Associated Place)

$0  Authority record control number or standard number redescribed in Appendix A (Control Subfields)

$4  Relationship code renamed Relationship and redescribed in:

400 (See From Tracing - Personal Name)

410 (See From Tracing - Corporate Name)

411 (See From Tracing - Meeting Name)

430 (See From Tracing - Uniform Title)

447 (See From Tracing - Named Event)

448 (See From Tracing - Chronological Term)

450 (See From Tracing - Topical Term)

451 (See From Tracing - Geographic Name)

455 (See From Tracing - Genre/Form Term)

462 (See From Tracing - Medium of Performance Term)

480 (See From Tracing - General Subdivision)

481 (See From Tracing - Geographic Subdivision)

482 (See From Tracing - Chronological Subdivision)

485 (See From Tracing - Form Subdivision)

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)

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)

788 (Complex Linking Entry Data)

$4  Relator code renamed Relationship and redescribed in:

371 (Address)

See also:

Appendix F:  Format Change Lists

Appendices