assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3716  rdfs:subClassOf  DOID:6217  _IRI        
1          0           graph  DOID:6217  oio:id           DOID:6217  xsd:string  
1          0           graph  DOID:4023  rdfs:subClassOf  DOID:6217  _IRI        
1          0           graph  DOID:8025  rdfs:subClassOf  DOID:6217  _IRI