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FRBR: Functional Requirements of Bibliographic Records

The 1998 revolution, first of several related "FR" conceptual models
FRBRer, entity-relationship
FRBRoo, object-oriented
FRAD, authority data
FRSAD, subject authority data
Extremely clear with music
Work, as conceived by the composer
Expression, three entities:
   Notated music presentation
Manifestation: each publication
Item: the single copy
Other concepts
Related work
   Adaptations, derived works
Impact on catalogues
Very slow, but now more and more effective