website ns problem... bug?

A colleague, showing me some perl to hack cdata html in xml,
picked my site to look at....

One item that 'failed' was on the stylesheet generated toc.


   <ul class="toc">
<li><a href="braille/braille.html">Braille Info</a>--
<span xmlns:html="http://www.w3.org/1999/xhtml" style="color:#7C7C7C;">A 
brief History</span></li>

This appears to be the only namespaced content in the page?
I.e. the rest is pure SGML.

Bug? Or just odd?

regards DaveP