唯一的要求就是，所有输入变量都在作为请求程序发送的服务请求的XML文档中传输，并从中进行提取。

The only requirement is that all input variables should be transferred and derived from the XML documents as the service request sent by the requesters.

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任何针对此上下文变量的后续请求都会返回已经准备好的课程集合。

Any subsequent request for this context variable returns the collection of courses already prepared.

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控件被绑定到输入和输出的请求变量。

The control is bound to the request variable for input and output.

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