This book constitutes the refereed proceedings of the 18th International Conference on Database and Expert Systems Applications, DEXA 2007, held in Regensburg, Germany, September 3-7, 2007.

The 86 revised full papers presented together with 1 invited paper were carefully reviewed and selected from 267 submissions. The papers are organized in topical sections on XML, data and information, datamining and data warehouses, database applications, WWW, bioinformatics, process automation and workflow, knowledge management and expert systems, database theory, query processing, as well as privacy and security.