文档绑定样式中的消息必须仅仅由形式良好、名称空间限定的XML组成。
A message in the document binding style must simply be made up of well-formed, namespace-qualified XML.
与各种应用程序进行集成时，有些可能需要采用事件处理模式工作，而此模式要求必须支持发布-订阅样式的消息交换方式。
When integrating various applications, some may need to work in the event-processing mode, which might mandate support for a publish-subscribe style of message exchange.
简而言之，document样式的消息基于XML模式元素定义，而RPC消息则使用XML模式类型定义。
In short, a document-style message is defined based on an XML schema element, and an RPC message is defined using an XML schema type.
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