Reasoning Web. Semantic Technologies for Information Systems : 5th International Summer School 2009, Brixen-Bressanone, Italy, August 30 - September 4, 2009, Tutorial Lectures - Sergio Tessaris, Enrico Franconi, Thomas Eiter, Claudio Gutierrez, Siegfried Handschuh, Marie-Christine Rousset, Renate A. Schmidt ((Lecture Notes in Computer Science))