通常pac包含制定访问控制决策所需的授权信息。
Usually PAC carries the authorization information that is used to make access-control decision.
访问决策子系统负责解析用户属性证书和提取用户属性，并根据访问策略信息和用户属性实现对资源的访问控制。
It deals with user's attribute certificate and implements the access control based on access policy and user's attributes.
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