assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050825  oio:id           DOID:0050825  xsd:string  
1          0           graph  DOID:10314    rdfs:subClassOf  DOID:0050825  _IRI        
1          0           graph  DOID:5877     rdfs:subClassOf  DOID:0050825  _IRI