Another almost-reinventing-Lisp in XML.com: Introducing RDFa, just messier.
You could represent HTML as a simple Lisp expressions - for example:
<a href="http://some/where" onclick="foo()">some content</a>
maps simply to the equivalent:
(a ((href "http://some/where") (onclick (foo))) "some content")
Don’t know what to do about this, but it is amusing, kinda.