This book constitutes the refereed proceedings of the 15th International Conference on Database and Expert Systems Applications, DEXA 2004, held in Zaragoza, Spain in August/September 2004.The 92 revised full papers presented were carefully reviewed and selected from 304 submissions. The papers are organized in topical sections on workflow, active and deductive database aspects, query processing, applications, knowledge processing and information retrieval, digital libraries, OLAP, mobile information systems, XML, distributed and parallel databases, advanced database techniques, bioinformatics, temporal and spatial databases, and Web and databases.
