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.
该控制策略的显著特点是以较低的计算复杂度实现整个系统受控，并使需要添加的控制库所和连接弧大大减少。
The main feature of this policy is that the net system can be controlled with minimal controlling places, arcs and low computational complexity.
连接线称为弧，笛卡尔坐标系统中的点称为节点。
The connecting lines are arcs, and the points within the Cartesian coordinate system are nodes.
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