...略通信比如，服务提供商可能会要求消费者提供Kerberos安全标示，才能取得某项服务这些要求被定义为策略断言（policy assertions）一项策略可能会包含多个断言WS-Policy用来标准化服务消费者和服务提供者之间的策略通信 it163 控制
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Business variables are assigned to a policy or policy assertion at design time.
业务变量在设计时被分配给一个策略或策略断言。
Among the properties of policy assertion (Figure 28), there are two fields worth noting.
在策略断言的属性中(图28)，有两个字段值得注意。
Role assignments are made at the configuration unit scope, and the policy that it inherits from its ancestor element and will apply if there is no explicit policy assertion attached to the element.
角色分配在配置单元范围内进行，如果没有附加到元素的显式策略断言，则将应用从其祖先元素继承的策略。
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