You almost certainly want to use the Restlet Internal Application Protocol (RIAP) http://wiki.restlet.org/docs_1.1/g1/13-restlet/48-restlet/86-restlet/90-restlet/45-restlet.html
This avoids either the overhead of an external HTTP call or the risk of error and tight bindings associated with directly calling between objects. RIAP gets heavy exercise by my company and Marc Portier's, even if nobody else really knows about it yet :-) - Rob
