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Volume 16 / Issue 1

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DOI:   10.3217/jucs-016-01-0198


LCP-Nets: A Linguistic Approach for Non-functional Preferences in a Semantic SOA Environment

Pierre Châtel (Thales Communications, France)

Isis Truck (LIASD - EA 4383, Université Paris, France)

Jacques Malenfant (Université Pierre et Marie Curie, France)

Abstract: 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. This variant, called LCP-nets, uses fuzzy linguistic information inside the whole process, from preference elicitation to outcome query computation, a qualitative approach that is more suitable to business process programmers. Indeed, in LCP-nets, preference variables and utilities take linguistic values while conditional preference tables are considered as fuzzy rules which interdependencies may be complex. The expressiveness of the graphical model underlying CP-nets provides for solutions to gather all the preferences under uncertainty and to tackle interdependency problems. LCP-nets are applied to the problem of selecting the best service among a set of offers, given their dynamic non-functional properties. The implementation of LCP-nets is presented step-by-step through a real world example.

Keywords: CP-nets, Web service filtering, fuzzy linguistic approach, preference modelling

Categories: H.3, J.0