assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:4160  rdfs:subClassOf  DOID:769  _IRI        
1          0           graph  DOID:769   oio:id           DOID:769  xsd:string  
1          0           graph  DOID:371   rdfs:subClassOf  DOID:769  _IRI        
1          0           graph  DOID:4163  rdfs:subClassOf  DOID:769  _IRI