Conversations: a conversation is a special form of interaction pattern where the parties involved have awareness of previously exchanged messages (that is, the parties hold state information).

对话：对话是一种特殊的交互模式形式，其中涉及的各方都知道之前交换的消息(即各方均保留状态信息)。

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For this reason, an XML schema definition is used to specify the precise format of messages that will be exchanged in the Web service interaction.

出于这个原因，将使用一个XML模式定义来指定将在Web服务交互中交换的消息的准确格式。

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Until now, there hasn't been a standard way to describe the flow of messages exchanged by a web service participating in a choreographed interaction with other services.

到现在为止，还没有一个标准的方法来描述通过 Web 服务与其它服务编排互动的方式来进行的信息流交换。

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