assertion  retraction  graph  subject    predicate    object                                   datatype    annotation
1          0           graph  DOID:4153  IAO:0000115  A chordoma that derives_from the spine.  xsd:string  "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007637""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://www.hopkinsmedicine.org/neurology_neurosurgery/conditions_main/chordoma.html""}]}"