This section is provided for the lists of format changes that accompany each update to the MARC 21 Format for Holdings Data.
This page documents the changes contained in the twenty-third update to the 1999 edition of the MARC 21 Format for Holdings Data. Update No. 23 (November 2016) includes changes resulting from proposals that were considered by the MARC 21 community during June 2016.
The following sections and fields were created/changed in Update No. 23 and should be printed to keep a print copy of the format up-to-date. Changes appear in red.