The following documents the changes contained in the twenty-fifth update to the 2000 edition of MARC 21 Format for Holdings 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:

337 (Media Type)

338 (Carrier Type)

347 (Digital File Characteristics)

883 (Machine-generated Metadata Provenance)

Appendix A (Control Subfields)

See also:

Appendix F:  Format Change Lists

Appendices