assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:1911  oio:id           DOID:1911  xsd:string  
1          0           graph  DOID:5348  rdfs:subClassOf  DOID:1911  _IRI        
1          0           graph  DOID:5342  rdfs:subClassOf  DOID:1911  _IRI