Entities and elements

The addition of an RDA entity or element to extend the semantics of RDA is carried out within the RDA Registry following established procedures.


A new concept can be added to an RDA vocabulary encoding scheme represented by a value vocabulary if the existing concepts do not cover the scope of the vocabulary.

Example of extension of an RDA value vocabulary

‹ex:1› "bone" used as a value of rdam:P30304 "has material"