<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Constraints for Service Contracts\r\n"^^ . "This paper focuses on client-service interactions distinguishing between three phases: negotiate, commit and execute. The participants negotiate their behaviours, and if an agreement is reached they commit and start an execution which is guaranteed to respect the interaction scheme agreed upon. These ideas are materialised through a calculus of contracts enriched with semiring-based constraints, which allow clients to choose services and to interact with them in a safe way. A concrete representation of these constraints with logic programs and logic program combinations is straightforward, thus reducing constraint solution (and consequently the establishment of a contract) to the execution of a logic program."^^ . "2011-03-05" . " " . . "Università di Pisa, Dipartimento di Informatica"^^ . . . . . . . . . . . . . . . . "Maria Grazia"^^ . "Buscemi"^^ . "Maria Grazia Buscemi"^^ . . "Mariangiola"^^ . "Dezani-Ciancaglini"^^ . "Mariangiola Dezani-Ciancaglini"^^ . . "Ugo"^^ . "Montanari"^^ . "Ugo Montanari"^^ . . "Mario"^^ . "Coppo"^^ . "Mario Coppo"^^ . . . . . "HTML Summary of #180 \n\nConstraints for Service Contracts \n\n\n" . "text/html" . . . "QA75 Electronic computers. Computer science"@en . .