For any library storing MARC Bibliographic records in Source Record Storage (SRS), FOLIO contains a default MARC-to-Instance map. FOLIO uses that map when creating or updating Inventory Instances with Source = MARC. The map identifies the Instance fields that are controlled by the underlying MARC Bibliographic record, and which fields and subfields of MARC data populate into which Instance fields. Occasionally libraries may adjust their default map, either because of 1) updated default mappings delivered in a new FOLIO release or 2) local fields or mapping decisions that differ from default map. When a library's default map is updated, those updated mappings will affect any Instances created or updated after the map change. However, some libraries would like to update all of their existing Instances to reflect the updated mappings. This script allows for that to happen.
NOTE: Add some info about how the script works, approximate timing, when to run it so as not to interfere with regular library operations
Examples of library-specific mapping changes:
- Add a mapping for the previous system's legacy bib ID. Usually it's something like a 9xx field (e.g. 907$a) mapping to a special identifier type (defined in Inventory Settings)
- Include 690 fields in the Instance subjects