針對當(dāng)前工作流模型沒有明顯的時間約束以及缺乏對復(fù)雜工作流系統(tǒng)支持的現(xiàn)狀，對經(jīng)典Petri 網(wǎng)在時間和層次方面進行擴展，提出了一個時間和層次擴充的THEWF-Net 工作
流模型。給出了該工作流模型的構(gòu)建算法，并采用此算法對辦公自動化系統(tǒng)中的產(chǎn)品開發(fā)流程和改造舊產(chǎn)品流程進行了建模，最后以實例對該工作流模型的正確性進行了驗證。
關(guān)鍵詞工作流；工作流模型；Petri 網(wǎng)
Abstract：At present the workflow model is short of time constraint and can’t 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.
Key words： workflow; workflow model; Petri-Net