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A Service Ranker Based on Logic Rules Evaluation and Constraint Programming


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Author: García Rodríguez, José María
Toma, Ioan
Ruiz Cortés, David
Ruiz Cortés, Antonio
Department: Universidad de Sevilla. Departamento de Lenguajes y Sistemas Informáticos
Date: 2008
Published in: Non functional Propertires and Services Level Agreeements in Service Oriented Computing, NFPSLA-SOC, 2008, Dublin, Irlanda
Document type: Presentation
Abstract: Ranking of Semantic Web Services is usually performed based on user preferences descriptions. These descriptions are expressed in terms of an underlying logical formalism, which limits their expressiveness. Thus, there are some kind of descriptions, such as utility functions, that cannot be handled by reasoners currently being used to perform Semantic Web Services tasks, though utility functions provide a higher level of expressiveness. in this work, we present a hybrid solution to allow the introduction of utility functions in user preferences descriptions, using both Logic Programming rules evaluation and Constraint Programming to perform the ranking process. This proposal is based on the Web Service Modeling Ontology, extending it with a highly expressive framework to specify user preferences, and enabling the integration of different engines to perform the ranking process.
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