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Distributed information systems are needed to be autonomous, heterogeneous and adaptable to the context. This is the reason why they resort Web services based on SOA Based on the advanced technology of SOA. These technologies can evolve in a dynamic environment in a well-defined context and according to events automatically, such as time, temperature, location, authentication, etc... This is what we call selfadaptability to context. In this paper, we are interested in improving the differentdoi:10.14569/ijacsa.2012.031201 fatcat:drlt7fflrze6zc3sdmcmkdkbvq