第二，现在我们想要更改我们的应用程序，使非web客户端也可以访问。
Second, we now want to change our application so that it can even be accessed by non-Web clients.
元数据api使客户端(如编译器)可以生成或访问组件的元数据，而无需公共语言运行时(CLR)加载类型。
The metadata API enables a client, such as a compiler, to generate or access a component's metadata without the types being loaded by the common language runtime (CLR).
这样允许这一个服务线程去活动代表那个客户端线程来访问在服务上的对象，或者是使对客户端自己的对象的访问生效。
This allows the server thread to act on behalf of that client to access objects on the server or validate access to the client's own objects.
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