默认策略可以是任意策略，包括您自己创建的策略。
The default policy can be any policy, including one that you create yourself.
这是易于扩展因子，包括您自己的自界说的毕竟或增列机制检索毕竟。
It is easy to extend Facter to include your own custom facts or to include additional mechanisms for retrieving facts.
由于可以为约束表达式设置任何任意的属性值(包括您自己定义的值)，或者在约束中使用它，因此存在很多可能。
Since you can set any arbitrary attribute value (and yes, that includes values that you define) to a constraint expression or use it in a constraint, there are a lot of possibilities.
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