assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:3306 IAO:0000115 A germ cell cancer that occurs in many forms. xsd:string "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007638""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://en.wikipedia.org/wiki/Germ_cell_tumor#Mixed""}]}"