assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050737  oio:id           DOID:0050737  xsd:string  
1          0           graph  DOID:0111366  rdfs:subClassOf  DOID:0050737  _IRI        
1          0           graph  DOID:1485     rdfs:subClassOf  DOID:0050737  _IRI        
1          0           graph  DOID:12177    rdfs:subClassOf  DOID:0050737  _IRI