This is the first book that provides a solid theoretical account of the foundation of the popular data format XML. Part I establishes basic concepts, starting with schemas, tree automata and pattern matching, and concluding with static typechecking for XML as a highlight of the book. In Part II, the author turns his attention to more advanced topics, including efficient 'on-the-fly' tree automata algorithms, path- and logic-based queries, tree transformation, and exact typechecking. The author provides many examples of code fragments to illustrate features, and exercises to enhance...