Workflow Model Based on Time-Extended and Hierarchy-Extended Petri-Net

At present the workflow model is short of time constraint and canpsilat support complex workflow systems, so the classical Petri-Net is extended in time and hierarchy in this paper. And based on the above extension a Time-Extended and Hierarchy-Extended Workflow-Net model is given. At the same time the construction algorithm of the model is also put forward in this paper. The algorithm is applied to model the new production-developed process and the old production-reconstructed process. Finally the correctness of the THEWF-Net model is validated.