我通过头部设置 -H "Accept: application/rdf+xml" 向服务器给出 Semantic Web 代理的信号，这样的头部设置表明用户代理期待的是一个 RDF 响应。

I signal a Semantic Web agent to the server with the header setting -H "Accept: application/rdf+xml", which means the user agent expects an RDF response.

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在口语对话系统中，根据系统提出的问题或者系统给用户的提示，对话管理器产生对用户响应的期待，也称作系统期待。

In the spoken dialog system, dialog manager may product the expectation of the user response called expectation of system according to the system questions or system prompts.

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