assertion  retraction  graph  subject   predicate        object    datatype    annotation
1          0           graph  DOID:713  rdfs:subClassOf  DOID:285  _IRI        
1          0           graph  DOID:711  rdfs:subClassOf  DOID:285  _IRI        
1          0           graph  DOID:285  oio:id           DOID:285  xsd:string