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In many practical applications, trade-offs involving non-functional attributes e.g., availability, performance play an important role in selecting component services in assembling a feasible composition, i.e., a composite service that achieves the desired functionality. The authors present TCP-Compose, an algorithm for service composition that identifies, from a set of candidate solutions that achieve the desired functionality, a set of composite services that are non-dominated by any other candidate with respect to the user-specified qualitative preferences over non-functional attributes. They use TCP-net, a graphical modeling paradigm for representing and reasoning with qualitative preferences and importance.
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