assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:7718  rdfs:subClassOf  DOID:3498  _IRI        
1          0           graph  DOID:7716  rdfs:subClassOf  DOID:3498  _IRI        
1          0           graph  DOID:3498  oio:id           DOID:3498  xsd:string  
1          0           graph  DOID:3497  rdfs:subClassOf  DOID:3498  _IRI