[Docutils-users] XHTML question

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By default Docutils generates HTML that starts with these two lines:

<?xml version="1.0" encoding="us-ascii"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

That looks fine to me, but the web hosting provider for my personal web
page (www.gerg.ca) is using some server-side software that gags on it.
For example, compare
  http://www.gerg.ca/software/optik/basic.html
with 
  http://optik.sourceforge.net/basic.html

If I remove the "<?xml ... ?>" line from the www.gerg.ca copy, it works
just fine.

I'm 99% sure that Docutils is in the right, and the server-side
expansion done by my web hosting provider is broken.  However, I would
like to be able cite chapter and verse of the XHTML spec to prove my
point.  Can someone point me in the right direction?

Thanks --

        Greg