assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4928  rdfs:subClassOf  DOID:4947  _IRI        
1          0           graph  DOID:4947  oio:id           DOID:4947  xsd:string  
1          0           graph  DOID:4682  rdfs:subClassOf  DOID:4947  _IRI