一个消息代表在Web服务描述语言(WSDL)规范中定义的一个概念；即，它是实际数据对服务和消费者有意义一个容器。

A message represents a concept as defined in the WSDL (Web Services Description Language) specification; that is, it's a container for actual data which has meaning to the service and the consumer.

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当容器从此前发送的请求接收到一条 Web 服务响应时，即调用这个回调处理程序。

The container invokes this callback handler when it receives a Web service response from the request sent earlier.

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