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Runtime adaptation of Web service compositions can often be done in several ways, so it is necessary to decide which adaptation approach to take. While many research projects studied runtime adaptation of Web service compositions or business processes, this paper presents the unique solutions that maximize business metrics, in cases when several Web service composition instances should be adapted at the same time. The authors specify all necessary information about possible adaptations and their business metrics as policies in the WS-Policy4MASC language and model the optimization problem in the powerful constraint programming language MiniZinc.
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