R. ALLEN WYKE is Vice President of Technology at Blue292, an environment, health, safety, and emergency management software company. His extensive programming experience includes XML, HTML/XHTML, JavaScript, C++, Java, Perl, and Visual Basic. He was the Webmaster columnist for SunWorld, and contributed a weekly article on integrating Windows and Unix to ITworld.com. He's written several books on Internet technologies such as Perl, JavaScript, and PHP.
ANDREW WATT is founder of XMML.com and an independent consultant in the United Kingdom. His extensive programming experience includes an expertise in XML and HTML/XHTML. He has served as technical editor on more than ten books covering XML and other Web technologies, and he is a contributing author to several XML and XHTML titles.