assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3579  rdfs:subClassOf  DOID:3301  _IRI        
1          0           graph  DOID:3578  rdfs:subClassOf  DOID:3301  _IRI        
1          0           graph  DOID:3301  oio:id           DOID:3301  xsd:string