Talk:Activity diagram

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Diagram is not valid UML 1.x nor UML 2.0

In UML 2.0, all flows into an activity must be active. So, this diagram would not get into the first activity. as the flow from the decision node is not active when the first activity is attempted to be entered. Technically the diagram is valid, it just can't execute.

In UML 1.x, a flow can't be split without using the fork bar. This diagram has a fork caused by unlabeled split node.