Composing Web services dynamically and semantically

Web services technology is emerging as a promising approach of integration and interaction for applications within and across organizational boundaries. But it is difficult to meet the practical requirements if only with the individual Web services. As a result, federating existing single Web services into composite Web services is not only necessary but also indispensable. This paper proposes a dynamic and semantic composition approach for Web services. In this approach, Web services are modeled with some rules whose heads and bodied are related with a semantic ontology used for eliminating the semantic conflicts in composition. Moreover, a nonbacktrace backward chaining algorithm is addressed to compose the existing Web services in a more efficient and automatic way. Given the inputs and expected outputs, the approach will automatically and dynamically generate a composition plan and convert it into BPEL4WS that can be executed and returns the results. The whole composition process can be done automatically and dynamically