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Why is Microsoft unique?: Page 2 of 3

wait for it...

You got it - business processes. Specifically, the activities and steps that make up a business process. Sound familiar?

WWF XAML:
BPEL :

Oooohhh.. now that's unique, isn't it?

Yes, there's some differences, but the core terminology - notice the term "sequence", Ron? - and concept is the same. They are both XML-based formats for referencing activities and interacting with a business process. Both are interpreted by a runtime engine. (BPEL -> BPEL Engine. WWF XAML -> WPF + WWF)