Tetronaught.
Get rid of all but one of the following elements:
xmlns="http://www.w3.org/1999/xhtml"
<?xml version="1.0" encoding="UTF-8"?>
I don't know what loving hellspawn of a loving stuff wysiwyg editor you used, but if it makes over a kilobyte of spare bullstuff in html you need to get a better one.
You can't get rid of any of these, as they are for some loving reason used for formatting:
<p>