assertion  retraction  graph  subject            predicate        object     datatype  annotation
1          0           graph  obo:TRANS_0000000  rdfs:subClassOf  owl:Thing  _IRI      
1          0           graph  DOID:3773          rdfs:subClassOf  owl:Thing  _IRI      
1          0           graph  DOID:5532          rdfs:subClassOf  owl:Thing  _IRI      
1          0           graph  DOID:6496          rdfs:subClassOf  owl:Thing  _IRI      
1          0           graph  DOID:6495          rdfs:subClassOf  owl:Thing  _IRI