每个链都可以有一个策略，它定义“缺省目标”，也就是要执行的缺省操作，当信息包与链中的任何规则都不匹配时，执行此操作。
Each chain can have a policy that defines "a default target", i.e. a default action to perform, if a packet doesn't match any rule in that chain.
与规则组一样，选择器拥有日期范围条目、选择条件和缺省目标。
Like a rule group, a selector has date range entries, selection criteria, and a default destination.
XM使用与这相同的规则，应用它自己的缺省样式表，而不考虑备用样式表。
XM uses the same rules and applies its own default style sheet instead of considering alternate style sheets.
XM使用与这相同的规则，应用它自己的缺省样式表，而不考虑备用样式表。
XM uses the same rules and applies its own default style sheet instead of considering alternate style sheets.
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