Mediating the Semantic Web

This paper introduces an extension of a mediator-wrapper architecture to integrate the semantic Web. The extensions are implemented in XLive, an XML mediator developed at PRiSM in the context of the WebSI European project. XLive is decomposing global XQuery to local ones according to source capabilities. After a short description of XLive and some recalls on the Semantic Web, an architecture encompassing three levels of ontology-based schemas is proposed. It is a hybrid architecture integrating both the local as view (LAV) and global as view (GAC) approaches. It allows the development of semantic Web wrappers and the progressive integration of sources according to global domain ontology. Finally, an extended XQuery mediator with view enrichment, a mapping design tool, and Web service wrappers allows full support of the three layered architecture.