primitiveType IdentifierURI

extends ivoa:anyURI

A reference to a registry record. This type should only be used if what is referenced must actually be a true Registry record; VOResource:IdentifierURI does not allow query or fragment parts and is hence not suitable for everything defined by IVOA Identifiers, in particular not standard keys (which are used for versions of standards, for instance) or dataset identifiers. When something does not need to be locked down to a reference to a single registry record, xs:anyURI should be used.