assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:8805  rdfs:subClassOf  DOID:3393  _IRI        
1          0           graph  DOID:5844  rdfs:subClassOf  DOID:3393  _IRI        
1          0           graph  DOID:3393  oio:id           DOID:3393  xsd:string