I would wait at least a day before emailing the author -
maybe someone here at the Monastery will figure it out. If
and when you do email the author, be very consise and
polite (you know this ;)). Matts has written many XML modules and perhaps he has used this one before, you might
want to /msg him and invite him to look at your question.
mirod is another XML Wizard, he may have an alternative
for you.
Another outlet is
http://rt.cpan.org - if this is a bug, you can
report it to the author at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=XML-Generator-PerlData