Abstract

A web service is a well-known technique for implementing Service-Oriented Architecture (SOA) on the web. One of its major characteristics is that it realizes loose coupling between services, utilizing reusable services. In this paper, we propose a concept based orchestration technique enabling us to specify service orchestration procedures with concepts by using eXtended Object-based Thesaurus (XOT). XOT is a knowledge base that represents service categories as concepts encompassing reusable services and service composition patterns as their relationships. It drastically enhances reusability of services available on the web by allowing us to use the concepts in an orchestration procedure instead of actual service names. Each concept would later be substituted by appropriate service names or constituent concepts before the substitution, if it is composite one. To demonstrate its feasibility, we implement a broker for the concept based orchestration, X-OTMonto as the XOT manager and extended jUDDI as our service repository.Keywordsweb servicesinformation retrievalontology

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