assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080882  oio:id           DOID:0080882  xsd:string  
1          0           graph  DOID:0081282  rdfs:subClassOf  DOID:0080882  _IRI        
1          0           graph  DOID:0081281  rdfs:subClassOf  DOID:0080882  _IRI