That page doesn't appears to be good ol' xhtml to me, not an xml page.
I've never messed around with xml in php to be fair but if it is possible to get html out, you'll notice in the source of WoW's site, things such as style sheets are not linked with the full path, as you don't have the style sheet stored locally (I prosume) it won't show up on your page!
Code:
if (is_ie7)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/ie7.css" />');
if (is_ie6 && !is_ie7)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/ie.css" />');
if (is_opera)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/opera.css" />');
if (is_opera && is_mac)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/opera-mac.css" />');
if (is_safari)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/safari.css" />');
if (is_mac)
document.write('<link rel="stylesheet" type="text/css" media="screen, projection" href="css/mac.css" />');