assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:3478  rdfs:subClassOf  DOID:240  _IRI        
1          0           graph  DOID:4353  rdfs:subClassOf  DOID:240  _IRI        
1          0           graph  DOID:240   oio:id           DOID:240  xsd:string