assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050739  rdfs:subClassOf  DOID:0050177  _IRI        
1          0           graph  DOID:0050735  rdfs:subClassOf  DOID:0050177  _IRI        
1          0           graph  DOID:0050177  oio:id           DOID:0050177  xsd:string