你好，
我认为他应该是基于DFA的，workflow 是基于.net framwork 开发的，我发现.net 正好是基于DFA的。详细信息，你可以参考这个文档：
https://tutorialforstudent.wordpress.com/
http://www.codeproject.com/Articles/4121/Generic-DFA-State-Machine-for-NET
希望对你有所帮助。
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