The difference is that XHTML 2.0 will never happen as the W3C working group on the matter has CLOSED: http://www.w3.org/MarkUp/
What's the difference between XHTML 2.0 and HTML 5.0. ?
There are debates as to what direction of the internet. I've also read articles that cite or discusses the plus and minuses of the two languages but I still am having problems with understanding their core difference.
HTML5 can be written according to strict xml rules and still parse correctly as HTML: http://html5doctor.com/html-5-xml-xhtml-5/
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