assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:1947     oio:id           DOID:1947  xsd:string  
1          0           graph  DOID:0050269  rdfs:subClassOf  DOID:1947  _IRI        
1          0           graph  DOID:0050270  rdfs:subClassOf  DOID:1947  _IRI