Can I just start by saying that I've only started learning xhtml so am a beginner in the language.

I'm working my way through Sam learning:Xhtml in 24 hours and am need a little help with the rel="external attribute.

I've tried the code written in the book a few times and I just can't get it to work! I've also tried google for an answer but again I can't see anything that I'm doing wrong!

<?xml version="1.0" encoding="UTF-8"?>

<html xmlns="" xml:lang="en">
<title>Test Page</title>
<script type="text/javascript" src="external.js"></script>
<a href="">Search</a>
<a href="" rel="external">Search</a>

I have highlighted the required script and attribute in red. Can somebody see where I'm going wrong please?!

Many Thanks