assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:9011  rdfs:subClassOf  DOID:786  _IRI        
1          0           graph  DOID:786   oio:id           DOID:786  xsd:string  
1          0           graph  DOID:2598  rdfs:subClassOf  DOID:786  _IRI        
1          0           graph  DOID:2596  rdfs:subClassOf  DOID:786  _IRI