For those ready to plunge into the Brave New World Wide Web of smart data and electronic commerce, Megginson (of Microstar Software Ltd.; Ontario, Canada) provides a tool more powerful than HTML for designing information structures: the eXtensible Markup Language (XML). Not for the clueless about DTDs or SGML, as there is no glossary. Includes a CD-ROM for plug-and-play parsing. Annotation c. by Book News, Inc., Portland, Or.