assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:1625  oio:id           DOID:1625  xsd:string  
1          0           graph  DOID:7539  rdfs:subClassOf  DOID:1625  _IRI        
1          0           graph  DOID:7538  rdfs:subClassOf  DOID:1625  _IRI        
1          0           graph  DOID:7540  rdfs:subClassOf  DOID:1625  _IRI