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/>
