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Soft Concurrent Constraint Programming

Stefano BistarelliContact Information, Ugo MontanariContact Information and Francesca RossiContact Information

(5)  Istituto per le Applicazioni Telematiche, C.N.R. Pisa, Area della Ricerca, Via G. Moruzzi 1, I-56124 Pisa, Italy
(6)  Dipartimento di Informatica, Università di Pisa, Corso Italia 40, I-56125 Pisa, Italy
(7)  Dipartimento di Matematica Pura ed Applicata, Università di Padova, Via Belzoni 7, 35131 Padova, Italy
Abstract
Soft constraints extend classical constraints to represent multiple consistency levels, and thus provide a way to express preferences, fuzziness, and uncertainty. While there are many soft constraint solving algorithms, even distributed ones, by now there seems to be no concurrent programming framework where soft constraints can be handled. In this paper we show how the classical concurrent constraint (cc) programming framework can work with soft constraints, and we also propose an extension of cc languages which can use soft constraints to prune and direct the search for a solution. We believe that this new programming paradigm, called soft cc (scc), can be very useful in many webrelated scenarios. In fact, the language level allows web agents to express their interaction and negotiation protocols, and also to post their requests in terms of preferences, and the underlying soft constraint solver can find an agreement among the agents even if their requests are incompatible.
Research supported in part by the the MURST Projects TOSCA and NAPOLI.

Contact Information Stefano Bistarelli
Email: Stefano.Bistarelli@iat.cnr.it

Contact Information Ugo Montanari
Email: ugo@di.unipi.it

Contact Information Francesca Rossi
Email: frossi@math.unipd.it
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