As you see, most are about the values I am using in the "rel" attributes, and one is a "XHTML Parsing error in input file: mismatched tag" which I cannot figure out what.
I guess they are getting the text/html version (same as IE gets) where you use <link> instead of <link/>.
The other warnings are simply rel values that aren't defined in HTML. For the popup thing you could (ab)use class or something instead, 'SHORTCUT ICON' should be just 'ICON', and the others should probably be class.
On an unrelated note, I think you're the first I've seen to use the XHTML+RDFa doctype and application/xhtml+xml -- I wonder when browsers will be forced to add it to the list of FPIs that enable the HTML entities...
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