The normal way to fetchpolicy Settings is to request a policy from a named policy set and yield all the Settings from a specific revision of the policy.
取得策略设置的通常的方式是从特定的策略集合中请求策略,并从特定的策略修正中产生所有的设置。
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The PMS can implement the ability for one service to inform another of the policy by allowing client services to fetchpolicy settings by domain name across multiple policies in a policy set.