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The Core SAC Subcommittee on Faceted Vocabularies (SSFV) facilitates the implementation and use of faceted vocabularies in library metadata. SSFV accomplishes its goals through development of best practices and training materials for catalogers/metadata creators, as well as strategies and mechanisms for retrospective application of faceted terms in legacy metadata. SSFV collaborates with other standards bodies such as the Library of Congress Policy Training and Cooperative Programs Division and the Program for Cooperative Cataloging, along with specialized communities of practice such as those focused on cataloging/metadata for music, audiovisual, law and cartographic resources. Where warranted, SSFV leads or participates in the development of new faceted vocabularies and/or the expansion/refinement of existing vocabularies, and in the development of metadata standards such as MARC 21. Lastly, SSFV is concerned with the optimization of faceted library metadata for user discovery of library resources, and seeks opportunities to lobby developers of discovery systems for improvements to search, display and indexing thereof.