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The HTML snippet for showing the icon of a successful XHTML + RDFa validation is itself not valid. The namespace shortcut is inconsistent (dc != dct). Wrong: <p about="" resource="http://www.w3.org/TR/rdfa-syntax" rel="dct:conformsTo" xmlns:dc="http://purl.org/dc/terms/"> <a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml-rdfa" alt="Valid XHTML + RDFa" /></a> </p> Should be: <p about="" resource="http://www.w3.org/TR/rdfa-syntax" rel="dct:conformsTo" xmlns:dct="http://purl.org/dc/terms/"> <a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml-rdfa" alt="Valid XHTML + RDFa" /></a> </p>
Thanks for your report. This issue has already been fixed in the development version and will go live with the next validator release.
Fix is included in 0.8.6.