AI Approaches to the Complexity of Legal Systems : International Workshops AICOL-I/IVR-XXIV, Beijing, China, September 19, 2009 and AICOL-II/JURIX 2009, Rotterdam, The Netherlands, December 16, 2009 Revised Selected Papers - Pompeu Casanovas, Ugo Pagallo, Giovanni Sartor, Gianmaria Ajani ((Lecture Notes in Computer Science))