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This paper addresses the problem of expressing preferences among nonfunctional properties of services in a Web service architecture. In such a context, semantic and non-functional annotations are required on service declarations and business process calls to services in order to select the best available service for each invocation. To cope with these multi-criteria decision problems, conditional and unconditional preferences are managed using a new variant of Conditional Preference networks (CPnets), taking into account uncertainty related to the preferences to achieve a better satisfaction rate.
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