From the reviews of the first edition: "This book covers schema extraction from an Extensible Markup Language (XML) data instance, algorithmic normalization of that schema ... and the discussion of relaxing the normalization to effect more efficient retrievals. ... Database designers and students are obvious targets for this book ... . The book is easy to read, and provides an approach to a very practical contemporary problem. The authors have organized their material for easy reading." (E.A. Unger, Computing Reviews, April, 2005) "Semistructured data are especially applied in web-applications. ... The book is written in English. It is recommended to both practitioners and researchers/students, who have to deal with the design and storage organization of semistructured data." (Waltraud Gerhardt, Zentralblatt MATH, Vol. 1076, 2006)