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。
Most of present workflow models lack formal definitions. So it is difficult to support the analysis on correctness and validity of process.
而且现有的工作流模型普遍缺乏严密的定义，很难支持对流程正确性、有效性的分析验证。
Yet knowledge management mechanisms can not be represented by current workflow process definition meta models.
当前的工作流过程元模型不支持对知识管理机制的表示。
For traditional workflow system, process models are defined in Build-time, in Run-time workflow enactment service interpret and execute these models.
传统工作流将在建立阶段对业务过程进行建模，在执行阶段由工作流执行服务对这些过程模型进行解释、执行。
As the core of workflow management system, workflow engine is responsible for process execution according to process models and work distribution by roles step by step to improve efficiency.
工作流引擎是工作流管理系统的核心部分，它根据流程模型来推进流程的执行，为每一步的执行角色分配工作，达到提高工作效率的目的。
As the core of workflow management system, workflow engine is responsible for process execution according to process models and work distribution by roles step by step to improve efficiency.
工作流引擎是工作流管理系统的核心部分，它根据流程模型来推进流程的执行，为每一步的执行角色分配工作，达到提高工作效率的目的。
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