l<?xml
version="1.0 ?>
l <!DOCTYPE book SYSTEM "http://somesite.org/book.dtd">
l <book id="nielsen01">
l <title>
l Designing
Web Usability
l </title>
l <info>
l <key>
l Design
l </key>
l <key>
l Internet
l </key>
l <isbn>
l 1-56205-810-X
l </isbn>
l </info>
l </book>