assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3478  oio:id           DOID:3478  xsd:string  
1          0           graph  DOID:6994  rdfs:subClassOf  DOID:3478  _IRI        
1          0           graph  DOID:4352  rdfs:subClassOf  DOID:3478  _IRI