assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5193  oio:id           DOID:5193  xsd:string  
1          0           graph  DOID:7949  rdfs:subClassOf  DOID:5193  _IRI        
1          0           graph  DOID:7951  rdfs:subClassOf  DOID:5193  _IRI