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if I get you right you have an RSS 0.91 feed and want to create a HTML version of this feed's content using PHP?
Try using magpierss class for PHP (a google search will lead you to the website), its as simple as
$rss = fetch_rss($url);
and the class returns the RSS content in an array that you can use to create your HTML.
Hope this helps and sorry if I didn't get you right...