MARC (Machine-Readable Cataloging) to MODS (Metadata Object Description Schema)

This document is intended for use in converting MARC 21 bibliographic records to MODS. Where multiple subfields are specified or implied in MARC, data will be concatenated with a space substituted for the subfield delimiter and subfield code. Where multiple MARC fields correspond to a single MODS element, each will be mapped to a separate instance of the element (with subfields concatenated). Because of this, it is not generally possible to perform a round-trip conversion without loss of specificity.

Links and documentation

Responsible people and organizations


Internal MSC ID

Version history


version 2016