调度平台用PDPEL对各类型节点和连接弧的形式化描述，以便工作流引擎进行项目调度。

The scheduling platform describes all the nodes and connections by PDPEL, so that the workflow engine can schedule the activities.

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工作流引擎是工作流管理系统的核心，是过程模型执行的平台。

Workflow engine is the core of workflow management system and a platform for the implementation of process model.

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接下来，分别对工作流管理平台和工作流引擎进行了设计和实现。

Then we design and realize workflow management platform and workflow engine.

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