assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5381  oio:id           DOID:5381  xsd:string  
1          0           graph  DOID:5438  rdfs:subClassOf  DOID:5381  _IRI        
1          0           graph  DOID:5437  rdfs:subClassOf  DOID:5381  _IRI