The specification defines a message exchange protocol between the BPEL engine and a task component.

这个规范定义了BPEL引擎和任务组件之间的消息交换协议。

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Then this paper expounds the design and realization of four main parts in the model. These parts are data Adapter, XML message component, data transmission and data exchange tool.

然后详细介绍模型的四个核心组成部分：数据适配器、XML消息组件、数据传输组件和数据交换工具的设计以及实现过程。

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