Compared with many workflow process models, the model based on Activity Network has the best readability.
在描述工作流过程的模型中，基于活动网络图工作流模型的可读性最好。
Through the hierarchical research of workflow process model, it is put forward three levels of workflow process models: meta model level, model level and control model level.
对工作流过程模型进行分层研究，提出了三层架构的工作流过程模型：元模型层、模型层和控制模型层。
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