assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4719  rdfs:subClassOf  DOID:2705  _IRI        
1          0           graph  DOID:2705  oio:id           DOID:2705  xsd:string  
1          0           graph  DOID:5638  rdfs:subClassOf  DOID:2705  _IRI