assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5926  rdfs:subClassOf  DOID:3495  _IRI        
1          0           graph  DOID:6931  rdfs:subClassOf  DOID:3495  _IRI        
1          0           graph  DOID:3495  oio:id           DOID:3495  xsd:string