An Algebra of Ontology Properties for Service Discovery and Composition in Semantic Web

An Algebra of Ontology Properties for Service Discovery and Composition in Semantic Web

Yann Pollet (CEDRIC Laboratory, France)
Copyright: © 2010 |Pages: 21
DOI: 10.4018/978-1-61520-859-3.ch004
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The authors address in this chapter the problem of the automated discovery and composition of Web Services. Now, Service-oriented computing is emerging as a new and promising paradigm. However, selection and composition of Services to achieve an expected goal remain purely manual and time consuming tasks. Basing our approach on domain concept definitions thanks to an Ontology, the authors develop here an algebraic approach that enables to express formal definitions of Web Service semantics as well as user information needs. Both are captured by the means of algebraic expressions of ontology properties. They present an algorithm that generates efficient orchestration plans, with characteristics of optimality regarding Quality of Service. The approach has been validated by a prototype and an evaluation in the case of an Health Information System.
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Emerging infrastructures such as the Semantic Web [Berners-Lee, 2001], the Semantic Grid [Goble, 2005] and Service Oriented architectures [Roman, 2005], support on-line access to a large number of resources from data sources and Web services to knowledge representation models such as taxonomies and ontologies. Ontologies play an important role in the Semantic Web and provide the basics for the definition of concepts and relationships that make information integration possible. OWL-S is proposed as a way to express more detailed descriptions of Web Services via a provided ontology of Web Services. But it remains limited and fails in expressing what a Service really provides, although services should ideally export also their semantics.

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