assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5913  rdfs:subClassOf  DOID:4693  _IRI        
1          0           graph  DOID:8389  rdfs:subClassOf  DOID:4693  _IRI        
1          0           graph  DOID:4693  oio:id           DOID:4693  xsd:string