assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6613  rdfs:subClassOf  DOID:5402  _IRI        
1          0           graph  DOID:5402  oio:id           DOID:5402  xsd:string  
1          0           graph  DOID:8104  rdfs:subClassOf  DOID:5402  _IRI