XML Topic Maps (XTM) represent a powerful new tool for transforming the Web from a vast, chaotic sea of data into a highly usable information resource. XML Topic Maps is the first comprehensive, authoritative guide to this new technology. Edited by Jack Park, a leader of the XTM community, with contributions from leading members of the community, it covers every aspect of XML Topic Map creation and usage. Drawing on the XTM 1.0 standard, a complete XML grammar for interchanging Web-based Topic Maps, this book shows how XML Topic Maps can be utilized as an enabling technology for the new "Semantic Web," in which information is given well-defined meaning, making it possible for computers and people to cooperate more effectively than ever before. Coverage includes: creating, using, and extending XML Topic Maps; ontological engineering; and the use of XML Topic Maps to create next-generation knowledge representation systems and search tools. Park shows how to use Topic Maps to visualize data; how Topic Maps relate to RDF and semantic networks; and finally, how Topic Maps presage a profound paradigm shift in the way information is represented, shared, and learned on the Internet -- and everywhere else. For every Web designer, developer, and content specialist concerned with delivering and sharing information in more useful and meaningful forms.