assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:1319 IAO:0000115 A central nervous system cancer that is characterized by the growth of abnormal cells in the tissues of the brain. xsd:string "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007637""},{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007641""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://www.cancer.gov/dictionary?CdrID=387264""}]}"