assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:116   oio:id           DOID:116  xsd:string  
1          0           graph  DOID:4699  rdfs:subClassOf  DOID:116  _IRI        
1          0           graph  DOID:6201  rdfs:subClassOf  DOID:116  _IRI