The Seventh International Workshop on Database Programming Languages (DBPL99) took place in Kinloch Rannoch, Perthshire, UK from the 1st to the 3rd of September 1999. This series of workshops focuses on the interaction of theory and practice in the design and development of database programming languages. The workshop has occurred biennially since 1987, and was previously held in: Rosco?, Finistere, France (1987) Salishan, Oregon, USA (1989) Nafplion, Argolida, Greece (1991) Manhattan, New York, USA (1993) Gubbio, Umbria, Italy (1995) Estes Park, Colorado, USA (1997) The workshop, as always, was organised as a mixture of invited speakers, informal paper presentations and discussion. Attendance at the workshop was limited to those who submitted papers and members of the Programme C- mittee, to ensure a su?ciently small forum for useful discussion. Before ?nding their way into this volume, papers were refereed by at least three members of the Programme Committee. Sixteen of the 31 submitted papers were accepted for presentation at the workshop. In the tradition of the series, authors were - couraged to improve their papers based on both referees' comments and ensuing discussion at the workshop, and resubmit them for publication in this volume, after which a further stage of refereeing took place. The result, we believe, is a volume of high-quality and well-polished papers. Two invited presentations were given, by Luca Cardelli (Microsoft Research Labs, Cambridge, UK) and Alon Levy (Univer

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 oftheirpapersforpublicationinthesepost-workshopproceedings.The13papers 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 o?cials of EBDT 98 for their invaluable support. Special thanks go to Paolo Merialdo, who actively participated in the organization of the workshop."