此响应的内容必须代表有效的 XHTML 代码。
The content of this response must represent valid XHTML code.
然后该回调对象就可以代表客户机处理此响应，或者将其移交给客户机。
This callback object can then process this response on behalf of the client or hand it over to the client.
响应类：这些类代表了被作为对API的请求的响应发送的XML数据。
Response classes: These classes represent the XML data that is sent in response to requests made to the API.
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