assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0081065  oio:id           DOID:0081065  xsd:string  
1          0           graph  DOID:0081071  rdfs:subClassOf  DOID:0081065  _IRI        
1          0           graph  DOID:0081070  rdfs:subClassOf  DOID:0081065  _IRI