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Integrating XML Data Sources using RDF/S Schemas: The ICS-FORTH Semantic Web Integration Middleware (SWIM) Koffina, Ioanna Serfiotis, Giorgos Christophides, Vassilis Tannen, Val Deutsch, Alin integration xml rdf schema Semantic Web (SW) technology aims to facilitate the integration of legacy data sources spread worldwide. Despite the plethora of SW languages e.g., RDF/S, OWL recently proposed for supporting large scale information interoperation, the vast majority of legacy sources still rely on relational databases RDB published on the Web or corporate intranets as virtual XML. In this paper, we advocate a Datalog framework for mediating high level queries to relational and or XML sources using community ontologies expressed in a SW language such as RDF/S. We describe the architecture and the reasoning services of our SW integration middleware, called SWIM, and we present the main design choices and techniques for supporting powerful mappings between different data models, as well as reformulation and optimization of queries expressed against mediation schemas and views. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Ioanna Koffina and Giorgos Serfiotis and Vassilis Christophides and Val Tannen and Alin Deutsch 2005 Is Part Of Dagstuhl Seminar Proceedings, Volume 4391, Semantic Interoperability and Integration (2005) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.04391.9 urn:nbn:de:0030-drops-340 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04391.9 eng https://creativecommons.org/licenses/by/4.0/legalcode