Template-based Composition of Semantic Web Services.

Abstract

Workflow templates are necessary for various different Web Service related tasks such as encoding business rules in a B2B application, specifying domain knowledge in a scien-tific Grid application, and defining preferences for users that interact with Web Services. Abstract activities in templates can be used to specify the features of a required service and concretes service can be discovered and used to generate ex-ecutable workflows. In this paper, we examine how Web on-tologies can be used to write such template descriptions that will allow flexible matchmaking of services. We discuss the importance of expressing preferences in templates and pro-vide a ranking algorithm based on DL inference services. We then present the HTN-DL formalism – an extension to the HTN planning formalism to generate compositions of Web Services based on these templates. Finally we present the experimental evaluation for the composition system we pro-posed.