assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0081409  rdfs:subClassOf  DOID:0081406  _IRI        
1          0           graph  DOID:0081408  rdfs:subClassOf  DOID:0081406  _IRI        
1          0           graph  DOID:0081407  rdfs:subClassOf  DOID:0081406  _IRI        
1          0           graph  DOID:0081406  oio:id           DOID:0081406  xsd:string  
1          0           graph  DOID:0081410  rdfs:subClassOf  DOID:0081406  _IRI