[Radiant] Can a part iterate over other parts?

[Ollivier Robert]

I'd like to have pages/parts structured like this:

A page with a "body" part which iterate over sub-pages. Each sub-page
contains several parts, one called "main" and others.  I'd like to
know how to iterate over the other parts. Is that possible?  Am I
clear enough?
-- 
Ollivier Robert -