Flow model: the Flow model is the actual XML representation of the directed graph that models the business process.
流程模型：流程模型实际就是用XML表示的一个对商业流程建模的指示性图表。
A flow is a directed graph with the activities as nodes and so-called links as edges connecting the activities.
flow是一个有向图，活动被表示为节点，所谓的links被表示为连接活动的边。
A flow is a directed graph with the activities as nodes and so-called links as edges connecting the activities.
flow是一个有向图，活动被表示为节点，所谓的links被表示为连接活动的边。
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