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Reported by Björn Höhrmann: In the good old days the validator confessed it's limited XML support by pointing at http://www.jclark.com/sp/xml.htm IIRC. Since the XML support is obviously not any better than before, the not should be reassembled.
I'll squeeze a note about this in somewhere.
Fixed. We now insert a "warning" (note) about limitations in the XML support if the file validated triggers XML mode.
Reopening, as current HEAD does not appear to have this note:
targeting 0.7.0, and noting that this absence is quite likely caused by Bug #1393
caveat note is back.