Editorial

摘要

This volume starts with a survey paper, contributed by authors from SAP Research, Germany. In particular, they discuss non-functional concerns in web services. As most web services related papers focus on the functional issues, such as what the services would do, non-functional issues focusing on how the services would perform, are very important. This paper discusses non-functional specifications and realization. A thorough evaluation of various approaches is also given. The regular paper section contains four regular papers. The first paper, by Mohamed Graiet, Raoudha Maraoui, Mourad Kmimech, Mohamed Tahar Bhiri and Walid Gaaloul (Tunisia), proposes a formalization of web service composition mediation, including meta modeling of composite service, semi formalization with this meta model, and finally formalization the mediation protocol.