assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050936  rdfs:subClassOf  DOID:0080347  _IRI        
1          0           graph  DOID:0080347  oio:id           DOID:0080347  xsd:string  
1          0           graph  DOID:0050892  rdfs:subClassOf  DOID:0080347  _IRI