assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080889  oio:id           DOID:0080889  xsd:string  
1          0           graph  DOID:0081255  rdfs:subClassOf  DOID:0080889  _IRI        
1          0           graph  DOID:0081254  rdfs:subClassOf  DOID:0080889  _IRI