assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050749  rdfs:subClassOf  DOID:0050743  _IRI        
1          0           graph  DOID:0080797  rdfs:subClassOf  DOID:0050743  _IRI        
1          0           graph  DOID:0081049  rdfs:subClassOf  DOID:0050743  _IRI        
1          0           graph  DOID:0050743  oio:id           DOID:0050743  xsd:string