单独代理，凡是代理权为一人所享有的。
WS - BrokersNotification：此规范允许非web服务实体创建一个发布者，此发布者会创建消息，并通过一个名为NotificationBroker的单独代理服务分发这些消息。
WS-BrokersNotification: This specification allows a non-Web service entity to create a publisher that creates messages and distributes them through a separate broker service called NotificationBroker.
这个方法不仅让我们无需单独生成服务代理，而且服务和服务消费者的实现都可以使用同样的服务接口。
The usage of this approach not only allows us to bypass service proxy generation, but also to use the same interfaces for both service and client implementation.
更好地利用资源；无需对每个虚拟应用程序进行单独的代理和缓存。
Resources are better utilized; there is no need to have separate proxy and caching for each virtual application deployment.
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