XML and Databases I -- XML and Databases II -- Database and Information Systems Architecture and Performance I -- XML and Databases III -- Database and Information Systems Architecture and Performance II -- Applications of Database Systems and Information Systems I -- Query Processing and Optimisation I -- XML and Databases IV -- Query Processing and Optimisation II -- Applications of Database Systems and Information Systems II -- Query Processing and Optimisation III -- Applications of Database Systems and Information Systems III -- Query Processing and Optimisation IV -- Data and Information Modelling I -- XML Query Processing and Optimisation I -- Data and Information Modelling II -- XML Query Processing and Optimisation II -- Data Mining I -- Semantic Web and Ontologies I -- Semantic Web and Ontologies II -- Data Mining II -- WWW and Databases -- Temporal and Spatial Databases -- Data and Information Semantics -- Closing Session: Knowledge and Design.

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 18th instance of the series of DEXA conferences was held at the University of Regensburg, Germany, September 3-7, 2007. Several collocated conferences and workshops covered specialized and comp- mentary topics to the main conference topic. Six conferences-the Eighth Inter- tional Conference on Data Warehousing and Knowledge Discovery (DaWaK), the Seventh International Conference on Electronic Commerce and Web Technologies (EC-Web), the Fifth International Conference on Electronic Government (EGOV), the 3rd International Conference on Trust, Privacy, and Security in Digital Business (TrustBus), the 3rd International Conference on Industrial Applications of Holonic and Multi-Agent Systems (HoloMAS), and the 1st International Conference on N- work-Based Information Systems (NBiS)-and 19 workshops were collocated with DEXA. The conference is a unique international event with a balanced depth and breadth of topics. Its much appreciated conviviality fosters unmatched opportunities to meet, share the latest scientific results and discuss the latest technological advances in the area of information technologies with young scientists and engineers as well as senior world-renown experts.