Advances in Databases and Information Systems : Associated Workshops and Doctoral Consortium of the 13th East European Conference, ADBIS 2009, Riga, Lativia, September 7-10, 2009. Revised Selected Papers

We would like to thank the authors, who submitted papers, and the program committees members, who did a great job of paper reviewing. We acknowledge the ADBIS 2009 Organizing and Steering Committees for their cooperation in organizing the workshop sessions. We hope that you ?nd the results presented here interesting and useful. September 2009 Janis Grundspenkis Yannis Manolopoulos Irena Mlynkova Mikolaj Morzy Martin Necasky Oksana Nikiforova Leonids Novickis Janis Osis Robert Wrembel Conference Organization Executive Committee General Chair JanisGrundspenkis(RigaTechnicalUniversity, Latvia) Program Chair Tadeusz Morzy (Poznan University of Technology, Poland) Gottfried Vossen (University of Munster ¨ , Germany) Program Committee Paolo Atzeni Italy Guntis Barzdins Latvia Andreas Behrend Germany Andras Benczur Hungary Maria Bielikova Slovakia Bostjan Brumen Slovenia Alina Campan USA Albertas Caplinskas Lithuania Sharma Chakravarthy USA Alfredo Cuzzocrea Italy Alin Deutsch USA Johann Eder Austria Janis Eiduks Latvia Johann Gamper Italy Jarek Gryz Poland Hele-Mai Haav Estonia Theo Haerder Germany Mirjana Ivanovic Serbia Hannu Jaakola Finland Manfred A. Jeusfeld The Netherlands Leonid Kalinichenko Russia Ahto Kalja Estonia Audris Kalnins Latvia Marite Kirikova Latvia Margita Kon-Popovska FYRO Macedonia Sergei Kuznetsov Russia Mehmed M.