Abstract. In this paper we describe IRS-III which takes a semantic broker based approach to creating applications from Semantic Web Services by mediating between a service requester and one or more service providers. Business organisations can view Semantic Web Services as the basic mechanism for integrating data and processes across applications on the Web. This paper extends previous publications on IRS by providing an overall description of our framework from the point of view of application development. More specifically, we describe the IRS-III methodology for building applications using Semantic Web Services and illustrate our approach through a use case on e-government. 1

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Key words: Existing services on the World-Wide Web tend to be "integral." For instance, online services for data analysis are available, but usually it is neither possible to modify the underlying reasoning system, nor to configure it for a different domain, nor to integrate different services to produce new functionalities. Our research goal is to develop the technological framework needed to provide sophisticated online problem-solving resources, configurable for different applications. We describe the design and initial implementation of the Internet Reasoning Servicea Web-based front-end enabling developers to prototype knowledge-based applications quickly out of reusable components in distributed libraries. Our aim is to make reliable problem-solving technology available to a wider audience and to provide the level of intelligent support needed to allow rapid generation of Web-based reasoning services.

Existing services on the Web tend to be `holistic'. For instance, online services for data analysis are available, but usually it is neither possible to modify the underlying reasoning system, nor to configure it for a different domain, nor to integrate different services to produce new functionalities. The goal of our research is to move beyond the current level of `holistic service provision' on the Web and to develop the technologies and frameworks needed to provide sophisticated online reasoning facilities, configurable for different domains and applications. In this paper we describe the Internet Reasoning Service, a Webbased front-end enabling application developers to prototype knowledge-based applications quickly out of reusable components from distributed libraries. The ultimate aim of our work is to make sophisticated problem solving technology available to a wider audience and provide the level of intelligent support needed to allow rapid generation of web-based reasoning services.

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