assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0060102  rdfs:subClassOf  DOID:1222  _IRI        
1          0           graph  DOID:6227     rdfs:subClassOf  DOID:1222  _IRI        
1          0           graph  DOID:1222     oio:id           DOID:1222  xsd:string