assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0060761  rdfs:subClassOf  DOID:8552  _IRI        
1          0           graph  DOID:0081088  rdfs:subClassOf  DOID:8552  _IRI        
1          0           graph  DOID:8552     oio:id           DOID:8552  xsd:string