assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:314   rdfs:subClassOf  DOID:200  _IRI        
1          0           graph  DOID:4305  rdfs:subClassOf  DOID:200  _IRI        
1          0           graph  DOID:200   oio:id           DOID:200  xsd:string