This volume is based on the contributions to the International Workshop on the Web and Databases (WebDB’98), held in Valencia, Spain, March 27 and 28, 1998, in conjunction with the Sixth International Conference on Extending Database Technology (EDBT’98). In response to the workshop call for papers, 37 manuscripts were submitted to the program committee. The review process was conducted entirely by- mail. While the quality of submissions was generally high, only 16 papers could be accepted for presentation within the limited time allowed by the workshop schedule. Authors of workshop papers were invited to submit extended versions of their papers for publication in these post-workshop proceedings. The 13 papers appearing in this volume were submitted and selected after a second round of reviews. We would like to thank the program committee of WebDB’98, all those who submitted their work, all additional reviewers, and the conference officials of EBDT’98 for their invaluable support. Special thanks go to Paolo Merialdo, who actively participated in the organization of the workshop.