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As Web services composition arouses a growing interest, most research works address implementation and execution issues. Therefore, many composition languages BPEL, XLANG, WSFL, and WSCI, to name a few of them have been proposed in the past few years. However, a weakness of these languages is that they are difficult to use in early stages of development, such as specification. In this paper, an extension to UML 2.0 called "UML-S: UML for Services" is introduced. UML-S allows for a Model Driven Engineering (MDE) of Web services and their interactions.
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