has reference

Classes can refer to an external source that defines them. Ideally, there is an existing defintion or specification in print that can be referred to. Classes can also refer to SKOS concepts according to Nen2660.

has reference

Classes can refer to an external source that defines them. Ideally, there is an existing defintion or specification in print that can be referred to. Classes can also refer to SKOS concepts according to Nen2660.