UpdateRequest request = UpdateFactory.create() ;
request.add(new UpdateDrop(Target.ALL)) ;
request.add(new UpdateCreate("http://example/g2")) ;
request.add(new UpdateLoad("file:etc/update-data.ttl", "http://example/g2")) ;
UpdateAction.execute(request, graphStore) ;
System.out.println("# Debug format");
SSE.write(graphStore) ;