Nasıl bir, bir uzak bir XML dosyasından bir nesne değişkeni olsun örneğin this one?

In PHP5 it works fine with simplexml_load_file(), but I need this to work in PHP 4 also. How can I do that? Or is there any built-in WordPress function that can load xml files? I tried using the WP's SimplePie class, but I get a weird object variable (with incorectly named fields etc).