assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8150  rdfs:subClassOf  DOID:7574  _IRI        
1          0           graph  DOID:7685  rdfs:subClassOf  DOID:7574  _IRI        
1          0           graph  DOID:7574  oio:id           DOID:7574  xsd:string