UML activity diagram is well-known for describing systems' dynamic behavior, and it is useful to model business process and workflow.
其中活动图是用来描述系统的动态行为，并且也适用于业务过程建模。
The discussion focuses on UML activity diagram extension, model description of event-driven mechanism and data-transfer mechanism.
重点讨论了UML活动图的扩展、事件驱动机制的模型描述和数据传递机制的模型描述。
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