assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0060522  rdfs:subClassOf  DOID:4376  _IRI        
1          0           graph  DOID:0060521  rdfs:subClassOf  DOID:4376  _IRI        
1          0           graph  DOID:4376     oio:id           DOID:4376  xsd:string