assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6052  oio:id           DOID:6052  xsd:string  
1          0           graph  DOID:7516  rdfs:subClassOf  DOID:6052  _IRI        
1          0           graph  DOID:7430  rdfs:subClassOf  DOID:6052  _IRI        
1          0           graph  DOID:7231  rdfs:subClassOf  DOID:6052  _IRI