The Identifier Ontology models non-RDF based Identifiers for resources. It is used to maintain a mapping between RDF resources identifiers and their equivalent IDs in an alternate, non-RDF based domain. @en
(2013-08-24) María Poveda-Villalón: Small vocabulary pointed for now only from "pns", a vocabulary from same "family" (pne, pna, pns, pni, pnc and pnt)