assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0081405  rdfs:subClassOf  DOID:0081402  _IRI        
1          0           graph  DOID:0081404  rdfs:subClassOf  DOID:0081402  _IRI        
1          0           graph  DOID:0081403  rdfs:subClassOf  DOID:0081402  _IRI        
1          0           graph  DOID:0081402  oio:id           DOID:0081402  xsd:string