assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0060091 IAO:0000115 An organ system benign neoplasm disease located_in the blood, heart, blood vessels or the lymphatic system. 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/Cardiovascular_system#Human_cardiovascular_system""}]}"