assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7922  IAO:0100001      DOID:6175  _IRI        
1          0           graph  DOID:7921  rdfs:subClassOf  DOID:6175  _IRI        
1          0           graph  DOID:5046  rdfs:subClassOf  DOID:6175  _IRI        
1          0           graph  DOID:6175  oio:id           DOID:6175  xsd:string