I've attached a document describing how ruleflow is implemented /
could be used in the future.  If anyone has got any suggestions or
improvements (on the API I'm proposing, or things you would like to
see differently), just let me know asap.

I think I'll be able to commit a first working version on svn soon.
Still have to include conditional connections (where a connection is
only selected if its condition evaluates to true), and some smaller
stuff.

Kris