assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4517  rdfs:subClassOf  DOID:2687  _IRI        
1          0           graph  DOID:2687  oio:id           DOID:2687  xsd:string  
1          0           graph  DOID:5712  rdfs:subClassOf  DOID:2687  _IRI        
1          0           graph  DOID:5273  rdfs:subClassOf  DOID:2687  _IRI