public String getOutputSkeletonXML(String caseID, String taskID) {
   YParametersSchema params = _paramsDefinitions.getParamsForTask(taskID);
   YWorkItem item = _engineClient.getWorkItem(caseID + ":" + taskID);
   YSpecificationID specID = item.getSpecificationID();
   YTask task = _engineClient.getTaskDefinition(specID, item.getTaskID());
   return Marshaller.getOutputParamsInXML(
       params, task.getDecompositionPrototype().getRootDataElementName());
 }