assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:6271   rdfs:subClassOf  DOID:10548  _IRI        
1          0           graph  DOID:6270   rdfs:subClassOf  DOID:10548  _IRI        
1          0           graph  DOID:10548  oio:id           DOID:10548  xsd:string