Database and Expert Systems Applications 20th International Conference, DEXA 2009, Linz, Austria, August 31 - September 4, 2009, Proceedings

The annual international conference on Database and Expert Systems Applications (DEXA) is now well established as a reference scientific event. The reader will find in this volume a collection of scientific papers that represent the state of the art of - search in the domain of data, information and knowledge management, intelligent systems, and their applications. The 20th edition of the series of DEXA conferences was held at the Johannes - pler University of Linz, from August 31 to September 4, 2009. Several collocated conferences and workshops covered specialized and comp- mentary topics to the main conference topic. Seven conferences–––the 11th Inter- tional Conference on Data Warehousing and Knowledge Discovery (DaWaK), the 10th International Conference on Electronic Commerce and Web Technologies (EC- Web), the 8th International Conference on Electronic Government (EGOV), the 6th International Conference on Trust, Privacy, and Security in Digital Business (Trust- Bus), the 4th International Conference on Industrial Applications of Holonic and Multi-Agent Systems (HoloMAS), the First International Conference on ePartici- tion (ePart), and the Second International Conference on Data Management in Grid and P2P Systems (GLOBE)–––and 14 workshops are collocated with DEXA. These events formed a unique international forum with a balanced depth and breadth of topics. Its much appreciated conviviality fostered unmatched opportunities to meet, share the latest scientific results and discuss the latest technological advances in the area of information technologies with both young scientists and engineers and senior world-renown experts. This volume contains the papers selected for presentation at the DEXA conference.