assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:5172  rdfs:subClassOf  DOID:289  _IRI        
1          0           graph  DOID:289   oio:id           DOID:289  xsd:string  
1          0           graph  DOID:1380  rdfs:subClassOf  DOID:289  _IRI