PEP组件向PD p组件发送消息，询问是否满足策略中的条件，并根据结果允许过程继续或停止过程。
A PEP component sends a message to the PDP component asking if a condition in the policy is met, or not, in order to allow the process to continue, or stop the process.
Ack - Requested：这一元素允许客户端来决定对于发送的消息是否需要确认。
Ack-Requested: This element lets the client determine whether an acknowledgement should be returned for a message sent.
Ack - Requested：这一元素允许客户端来决定对于发送的消息是否需要确认。
Ack-Requested: This element lets the client determine whether an acknowledgement should be returned for a message sent.
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