assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0060116  oio:id           DOID:0060116  xsd:string  
1          0           graph  DOID:833      rdfs:subClassOf  DOID:0060116  _IRI        
1          0           graph  DOID:2174     rdfs:subClassOf  DOID:0060116  _IRI