Did you miss Sylvains (and my) answer to your earlier question about the TreeProcessor? http://marc.theaimsgroup.com/?t=106641586800001&r=1&w=2
AFAIK Sylvain has written nearly all of (or maybe all of) the TreeProcessor, Ovidiu created flowscripts together with Christopher.
Actually, I missed those. Between the volume of mail on this list and the amount of work I am doing at work--it went through without my eyes finding it. I saw the initial "I'm not sure either" messages, then the thread switched to OJB stuff, and then now that I went back to search for it back to the original topic.
--
"They that give up essential liberty to obtain a little temporary safety
deserve neither liberty nor safety."
- Benjamin Franklin