assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050620  rdfs:subClassOf  DOID:5974  _IRI        
1          0           graph  DOID:5974     oio:id           DOID:5974  xsd:string  
1          0           graph  DOID:5973     rdfs:subClassOf  DOID:5974  _IRI