1 1 0 http://purl.obolibrary.org/obo/IAO_0000578 centrally registered identifier 'centrally registered identifier' SubClassOf 'information content entity' 'centrally registered identifier' SubClassOf http://purl.obolibrary.org/obo/IAO_0020000 http://purl.obolibrary.org/obo/IAO_0020000 identifier 'identifier' SubClassOf 'information content entity'