Roberto De Virgilio is with Universita di Roma Tre as PostDoc fellow under the supervision of Riccardo Torlone. The last years his research focuses on Semantic Web information management at different levels of abstraction. Fausto Giunchiglia is professor of computer science at the University of Trento, Department of Information and Communication Technology, ECCAI Fellow. His research has covered many different areas: knowledge representation, context and reasoning with context, knowledge management and peer-to-peer knowledge, semantic web, formal methods, theorem proving, and model checking. Letizia Tanca is a full professor with Politecnico di Milano. Her research interests range over all database theory, especially on deductive, active and object oriented databases, graph-based languages for databases, and the semantics of advanced database and information systems, representation and querying of semistructured information. Her most recent research interests concern context-aware database design, data integration, schema evolution, mobile databases and very small databases for mobile devices.