assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:3540 IAO:0000115 A cerebral ventricle cancer that is located_in the plexus located_in the ventricles of the brain. 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/Choroid_plexus""}]}"