assertion  retraction  graph  subject    predicate    object                                                                  datatype    annotation
1          0           graph  DOID:3620  IAO:0000115  A nervous system cancer that is located_in the central nervous 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/Central_nervous_system""}]}"