<p>NEIL BRADLEY is an XML consultant with almost 20 years' practical experience using markup languages. He is an experienced trainer, a regular speaker at industry events, and a contributor to publications such as <i>XML Journal</i> and <i>interChange</i>, the newsletter of the International SGML/XML Users' Group. He is the author of three books on XML and SGML topics published by Addison-Wesley: <i>The XML Companion, Third Edition</i> (2002), <i>The XSL Companion, Second Edition</i> (2002), and <i>The Concise SGML Companion</i>...