P1VoidReply访问应答消息的方式必须与P1S1Transform访问请求消息相同。
P1VoidReply must access the reply message in the same way P1S1Transform accessed the request message.
攻击者不能访问一个请求中所有的包，也就不能破译发送的消息。
The attacker cannot access all the packets of a request and cannot decipher what message was sent.
XACML构建于SAML之上，提供了用于定义访问控制和授权请求及响应消息的实际语义。
XACML builds on SAML by providing the actual semantics used to define access control policy and authorization request and response messages.
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