assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4919  oio:id           DOID:4919  xsd:string  
1          0           graph  DOID:4918  rdfs:subClassOf  DOID:4919  _IRI        
1          0           graph  DOID:6844  rdfs:subClassOf  DOID:4919  _IRI        
1          0           graph  DOID:5534  rdfs:subClassOf  DOID:4919  _IRI        
1          0           graph  DOID:5974  rdfs:subClassOf  DOID:4919  _IRI