Semantic Annotation Based Service Composition for Grid Workflow Description and Execution

Abstract

The main purpose of the research work presented in this paper was to model and implement a workflow based architecture for Web service composition which allows the integration of composed Web services in a Grid middleware. The composed Web services are integrated as computational nodes in a workflow description and execution platform. To prove the presented theoretical concepts, a prototype was also implemented based on the gProcess application [13] in which the Web services are integrated as satellite image operators in workflows used for processing satellite images. The urge for such a research work was driven by the lack of flexibility offered by the static deployed applications and the need of a dynamic approach given by Web services developed and deployed all over around the world. The proposed solution is a semi-automatic Web service composition based on predefined templates and realized in several steps: automatically search in a private registry, perform semantic annotation, automatically bind information of founded services and create a BPEL business process. This solution offers a dynamic approach and allows a high degree of reusability and interoperability in a Grid medium.