The Agent properties element set consists of properties representing the attributes and relationships of the RDA Agent, Person, Family, and Corporate Body entities. Each property in the element set has a domain of the class representing one of these entities. @en
The Unconstrained properties element set consists of properties representing the attributes and relationships of the all RDA entities. Each property in the element set has semantics which are independent of the FRBR model and has no specified domain or range. @en
The Expression properties element set consists of properties representing the attributes and relationships of the RDA Expression entity. Each property in the element set has a domain of the class representing this entity. @en
The Classes element set consists of classes representing the RDA entities, including Work, Expression, Manifestation, Item, Person, Family, Corporate Body, and Agent. @en