assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0060049  oio:id           DOID:0060049  xsd:string  
1          0           graph  DOID:9808     rdfs:subClassOf  DOID:0060049  _IRI        
1          0           graph  DOID:0040094  rdfs:subClassOf  DOID:0060049  _IRI