As Christine Schwartz observed in the Cataloging Futures blog, I don’t believe that MARC is the problem with the OPAC or issues with findability.
Functional Requirements for Bibliographic Records—or FRBR—is the key to organizing bibliographic records using the entity relationship model. An entity is an object that can be uniquely identified. The Marc record itself is an entity—a specific bibliographic edition. Within that entity are other entities (aka access points)—author and subject, for example. RDA is the FRBR inspired code that adds other uniquely identified entities—the aspects of work, expression, and manifestation.
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