Building applications using end to end composition of web services

Web services have received much interest in industry due to their potential in facilitating seamless business-to-business or enterprise application integration (S. Staab et al. 2003; Srivastava & Koehler 2003). Web services offer standard-ized interface description, discovery (using a registry like UDDI) and messaging mechanisms. Also, the program-ming tools and runtime environments for web services have now matured. A component-oriented software development approach where each piece of software is wrapped as a web service would offer substantial benefits in application integration and we demonstrate this for a mobile service provider scenario. Given the intense competition in the telecom sector, mo-bile telephony service providers need to continually develop compelling applications to attract and retain end-users, with