在这两种情况下，中介流引擎的底层行为非常类似。
The underlying behaviour of the mediation flow engine is very similar in both cases.
因此，意在用控制流捕获事件的建模行为会导致多种语义问题。
Consequently, a modeling practice that captures events with control flow leads to various semantic problems.
不幸的是，在UML 1中，行为建模在流的类型方面有大量严格的限制，这些限制被提出了异议。
Unfortunately, the UML 1 version of activity modeling had a number of serious limitations on the types of flows that could be represented.
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