His research interests include database and semi-structured data integration, data linking, Web-based information systems, data analysis, and knowledge representation and evolution. On these topics, he worked in national and international research projects, including EU FP6 BOEMIE, the FP6 INTEROP NoE, and the ESTEEM (Emergent Semantics and cooperaTion in multi-knowledgE EnvironMents) PRIN project funded by the Italian Ministry of Education, University, and Research, and the EVA Project funded by the Italian Agency for the Evaluation of Research and Universities. He is also author of more than 80 contributions as papers in international conferences and journals, and chapters in international books. He served as program committee member of various international conferences and he is a founder and part of the board of the instance matching track at the Ontology Alignment Evaluation Initiative (OAEI).