The paper gives a new insight into the cataloguing practice in the COBISS.SI system, primarily regarding the necessity of bibliographic data for the management of bibliographies for researchers and research organisations. The paper evaluates two areas in the cataloguing practice, both of them optional but recommended.
Resource Description and Access (RDA), the successor to the Anglo-American Cataloging Rules (AACR), has had a significant impact on both bibliographic and authority data as they are represented in Machine-Readable Cataloging records in MARC 21. A brief history of the develoment of RDA is outlined. Since 2006, OCLC has kept up with some fifteen MARC 21 Bibliographic, Authority, and Holdings Updates through a total of nine OCLC-MARC Updates.