Entities and elements

An RDA entity or element can be sub-typed for a local application.

Example of sub-typing an RDA element

‹ex:1› "has manifestation title statement" declared as a sub-property of rdam:P30293 "has manifestation title and responsibility statement"

A less formal refinement of an RDA entity can be made using its "category" element.

Example of categorizing an RDA entity

"screenplay" used as a value of rdaw:P10004 "has category of work".


A concept from an RDA vocabulary encoding scheme can be refined by a narrower concept.

Example of refining an RDA value concept

‹ex:1› "iron" declared as narrower to rdamat:1022 "metal".