As a platform for library-centric apps, FOLIO’s approach to metadata involves creating a generalized view of the various types of records (bibliographic, holdings, authority, patrons, etc.) that all FOLIO apps must understand while retaining the detailed records for apps that can understand and make use of that detail. For instance, the app that checks in and checks out physical books does not need to understand the precise nature of the MARC 245 indicators and subfields; it just needs a title to display on the screen to confirm to the operator that the item at hand is the item being checked out. Likewise, an app that counts the usage of a particular thesis does not need to understand the metadata elements that distinguishes a thesis advisor from the degree candidate. This subset of metadata is being called the FOLIO Codex.
The recording of the Forum is available in the Open Library Foundation YouTube channel:
FOLIO Codex Intro - Google Slides from Kristen Wilson
Codex Data Objects & Metadata fields - Google Slides from Lynn Whittenberger