Firstly we need to query PHP variable and check if the browser supported output is ok:
I suggest this gets added after the include_once('lib/debug/debugger.php'); somewhere near the bottom of tiki-setup.php
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if (strstr($_SERVER['HTTP_ACCEPT'], 'application/xhtml+xml')) { header("Content-type: application/xhtml+xml"); } else { header("Content-type: text/html"); }
Fingers crossed that should work.
Ive tested on a older 1.7 installation.
Damian