FRBRoo models in detail the process of assigning identifiers and constructing controlled access points. The FRAD model puts its emphasis on the separation between the bibliographic entities themselves (person, family, corporate body, work), their names as found in the non-bibliographic universe and the controlled access points constructed to represent the instances of the entities in bibliographic contexts through the use of rules as applied by bibliographic agencies. In FRBROO the mechanism that underlies these relationships is made explicit by the introduction of classes and properties that capture the link between instances of persons, etc. and the names they use when performing different activities over time.
(Source: FRBR Object-oriented definition and mapping from FRBRer, FRAD and FRSAD (version 2.2), March 2015)