RSS/Atom parser

Is there an RSS parser that works well with LispWorks?  I'm looking
for something similar to Mark Pilgrim's Universal Feed Parser ?  The
Universal Feed Parser is written in Python and I'd like to stick to a
100% Lisp environment.

Or do I need to write my own parser?

Thanks!

Regards,
Chris Dean

P.S. More info the Universal Feed Parser is here
     http://diveintomark.org/projects/feed_parser/