if (operation == null) throw new Exception( "no web service operation available" );
Web_service_request request = operation.request();
if (request == null) throw new Exception( "no web service request available" );
Web_service_response response = operation.response();
if (response == null) throw new Exception( "no web service response available" );
if (spooler_task.params().value("response_stylesheet") != null && spooler_task.params().value("response_stylesheet").length() > 0) {
// .. either transform the response from order parameters and payload
Xslt_stylesheet stylesheet = spooler.create_xslt_stylesheet();