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Running the checker on http://dodosuko.mobi makes the checker fail in the XSLT processing, apparently because the XSLT processor then stumbles on an invalid character: SXXP0003: Error reported by XML parser: Character reference "" is an invalid XML character Probably a sign that the Moki document isn't always well-formed (which it should be)
I "fixed" this in the sense that the tests won't run in this case, because crucially the XSL processor can't operate on the document, which renders most tests meaningless. It still registers as an overall failure.