[XBL] duplicate ID...

The first occurance of "div-element-example" should probably be changed to  
something like "xbl-pseudo-example".

Besides that, there seems to be another validation error. See  
http://validator.w3.org/check?uri=http%3A%2F%2Fdev.w3.org%2Fcvsweb%2F%7Echeckout%7E%2F2006%2Fxbl2%2FOverview.html


-- 
Anne van Kesteren
<http://annevankesteren.nl/>
<http://www.opera.com/>