I made a small change to my earlier post, at first I had the error_reporting(7) right below the require, but it should go at the end of the newsfeedpal.php script.
It doesn't give any error at all? That is very weird.
Is the permissions correct for rdf.class.php? Is it readable by the web server?
Did you get any output when putting in an echo statement at the top of rdf.class.php? If you don't that script isn't loaded at all...