(Yaf >=1.0.0)
Yaf_Route_Simple resolves the route info from
the query string. All you need to do is tell
Yaf_Route_Simple which key in
$_GET is the module, which key is the controller,
and which key is the action.
Yaf_Route_Simple::route() claims the request
(returns true) as soon as at least one of those keys is present in
the query string, so routes registered after it in the stack will not
be tried for such a request. It only passes (returns false) when
none of the configured keys appear.