This book constitutes the refereed proceedings of the 5th International XML Database Symposium, XSym 2007, held in Vienna, Austria, in September 2007 in conjunction with the International Conference on Very Large Data Bases, VLDB 2007.

The 8 revised full papers together with 2 invited talks and the extended abstract of 1 panel session were carefully reviewed and selected from 25 submissions. Covering all current aspects of core database technology for XML data management, XML and data integration, and development and deployment of XML applications, the papers are organized in topical sections on XPath query answering, XQuery evaluation and performance, as well as XML updates, temporal XML data and concurrency.