public static void main(String[] args) {
XStream xstream = new XStream();
xstream.alias("rules", InternalRules.class);
xstream.alias("rule", InternalRule.class);
xstream.addImplicitCollection(InternalRules.class, "rules");
xstream.useAttributeFor(InternalRule.class, "merger");
InternalRules rules = new InternalRules();
List<InternalRule> rList = new ArrayList<InternalRule>();
InternalRule r1 = new InternalRule();
r1.setNamespace("com.alibaba.cobar.client.entity.Follower");