Abstract
Web services and web service composition languages for web service choreography are becoming more and more important in the area of inter-enterprise integration. A huge amount of work has been done in the area of web service composition languages. However, the aspects of modelling these specific kinds of software systems have not been studied in detail, in contrast to the definition of business processes where a lot of well-known techniques exist. In this paper, we show how the usage of UML 2.0 and agent specific extensions of it can contribute to the specification of web service choreography. We will start by introducing the notion of web services and web service compositions languages. Then we show how business processes can be specified using UML 2.0 in general by a small case study. Next these business processes are refined to the level of negotiation and processes between web services.
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