PHP4 Compatibility

As pointed out in #271572: Need more documentation, the current version is not compatible with PHP4. I've edited the code to parse correctly under PHP4, but the bottleneck to making the module functional seems to be simplexml_load_string(). I am working to find a replacement for this function which was introduces only since PHP 5, but if anyone can jump in, that would be very helpful. This seems to be the last hurdle in offering php4 compatibility, so if anyone has experience with converting XML to objects or arrays, jot down a note.
The function is used in scribd.php to parse the XML response from scribd into an object (which is then converted into an array).
Rareş