books.xml:
<?xml version="1.0"?>
<books xmlns:dc="http://purl.org/dc/elements/1.1/">
<!-- This is a comment -->
<book id="1" isbn="3-8266-0612-4">
<title>Apache Web-Server</title>
<year>2000</year>
<dc:subject>Webserver</dc:subject>
</book>
<book id="2" isbn="3-8266-0550-0">
<title>Linux für Internet und Intranet</title>
<year>2000</year>
<dc:subject>Operating Systems</dc:subject>
</book>
<?php print "this is a processing instruction"; ?>
</books>
