private static void registerConverters(XStream xstream) {
xstream.registerConverter(new InsertConverter(xstream));
xstream.registerConverter(new RetractConverter(xstream));
xstream.registerConverter(new ModifyConverter(xstream));
xstream.registerConverter(new GetObjectConverter(xstream));
xstream.registerConverter(new InsertElementsConverter(xstream));
xstream.registerConverter(new FireAllRulesConverter(xstream));
xstream.registerConverter(new StartProcessConvert(xstream));
xstream.registerConverter(new SignalEventConverter(xstream));
xstream.registerConverter(new CompleteWorkItemConverter(xstream));