Abstract
Web services have been employed in a wide range of applications and have become a key technology in developing business operations on the Web. In order to leverage on the use of Web services, Web service discovery and composition need to be fully supported. Several systems have been proposed to meet this need. However, these systems usually support either discovery or composition of Web services but not both. Moreover, these systems assume the Web services are based on the same ontology. Existing Web service discovery systems are not able to discover heterogeneous ontology Web services. This paper introduces a Web service discovery and composition system which supports Web services based on different OWL-S ontologies. The discovery process is executed first in order to search for a single Web service that satisfies a requester. If a single Web service cannot be found, multiple Web services are composed to satisfy the request.
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