Database and Expert Systems Applications : 10th International Conference DEXA’99 Florence Italy August 30 – September 3 1999 Proceedings This book constitutes the refereed proceedings of the 10th International Conference on Database and Expert Systems Applications DEXA99 held in Florence Italy in August September 1999. The 105 revised papers presented together with three invited papers were carefully reviewed and selected from a total of 241 submissions. The volume addresses all current aspects of advanced information systems applications. The papers are organized in topical sections on object oriented databases; fundamentals; queries; advanced information systems; workflow management systems; heterogeneous distributed and federated databases; transactions; data warehousing and data mining; spatial databases; internet applications; and temporal databases