The number ofbooks on databases is very large. Thus, our decision to yet add another book to the body of literature requires some justification. However, even a cursory glance through this book will show that we have taken a rather different approach indeed when compared to monographs on databases. First, material ties together the well-known relational model with the newer and not yet as solidly established object oriented one and leads to data models for hypermedia system. This is unique and timely: the chaos on the World Wide Web is getting out of hand, and one ofthe main reasons is that...