assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:7071   rdfs:subClassOf  DOID:2658  _IRI        
1          0           graph  DOID:2658   oio:id           DOID:2658  xsd:string  
1          0           graph  DOID:5117   rdfs:subClassOf  DOID:2658  _IRI        
1          0           graph  DOID:13691  rdfs:subClassOf  DOID:2658  _IRI