assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080321  rdfs:subClassOf  DOID:0080320  _IRI        
1          0           graph  DOID:0080320  oio:id           DOID:0080320  xsd:string  
1          0           graph  DOID:482      rdfs:subClassOf  DOID:0080320  _IRI