"XML: The Complete Reference by Heather Williamson is a comprehensive textbook on computer programming, specifically focusing on XML and HTML. Published by McGraw-Hill Osborne in 2001, this 965-page trade paperback covers a wide range of topics within the subject area of computers and web programming. The book is suitable for beginner, intermediate, and advanced learners, making it a valuable resource for anyone looking to deepen their understanding of programming languages and internet technologies. Heather Williamson's expertise in the field and engaging writing style make this textbook a must-have for students and professionals alike."