采用标准消息的形式进行通信，对有关查询或查询响应的信息进行编码。
Communications take the form of a standard message that encodes information about a query, or a response to a query.
需要注意的重要一点是，WS - Polling允许它的GetMessage请求查询任何以该客户机为目的地的消息——不只是响应消息。
It is important to note that WS-Polling allows for its GetMessage request to query for any messages destined for the client — not just responses messages.
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