assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4848  oio:id           DOID:4848  xsd:string  
1          0           graph  DOID:4853  rdfs:subClassOf  DOID:4848  _IRI        
1          0           graph  DOID:6286  rdfs:subClassOf  DOID:4848  _IRI