in order to have sphider index xml files, you will have to do some changes to the file
/admin/spiderfuncs.php
line number 154
you will see something like this:
else if (($regs[1] == 'application/msword' || $regs[1] == 'application/vnd.ms-word') && $index_doc == 1) {
$status['content'] = 'doc';
$status['state'] = 'ok';
}
add one more Else if that will take care of the 'text/xml' type
Diego Medina
Web Developer