31 Daniel Abril Guillermo Navarro-Arribas Vicenç Torra 2010 Vicenç Torra, Yasuo Narukawa, Marc Daumas Modeling Decisions for Artificial Intelligence, MDAI 2010 Perpignan, France Springer 6408 266-276 Lecture Notes in Artificial Intelligence 27-08-2010 Web indexing task,classification task,frequency term vector,k-anonymity preservation,privacy preserving information retrieval,semantic microaggregation,Internet,data privacy,information retrieval,pattern classification,vectors In the data privacy context, specifically, in statistical disclosure control techniques, microaggregation is a well-known microdata protection method, ensuring the confidentiality of each individual. In this paper, we propose a new approach of microaggregation to deal with semantic sets of categorical data, like text documents. This method relies on the WordNet framework that provides complete semantic relationship taxonomy between words. Therefore, this extension aims ensure the confidentiality of text documents, but at the same time, it should preserve the general meaning. We apply some measures to evaluate the quality of the protection method relying on information loss. http://www.springerlink.com/content/f41402862155w6t4/