assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6847  rdfs:subClassOf  DOID:3255  _IRI        
1          0           graph  DOID:6788  rdfs:subClassOf  DOID:3255  _IRI        
1          0           graph  DOID:6786  rdfs:subClassOf  DOID:3255  _IRI        
1          0           graph  DOID:3255  oio:id           DOID:3255  xsd:string