assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:8692 oio:id DOID:8692 xsd:string 1 0 graph DOID:8527 rdfs:subClassOf DOID:8692 _IRI 1 0 graph DOID:9119 rdfs:subClassOf DOID:8692 _IRI 1 0 graph DOID:8552 rdfs:subClassOf DOID:8692 _IRI