Missing in Goals?

I'm a little concerned that I am not seeing any traces of reliable messaging
-- that is, guaranteed delivery, only-once delivery and so on -- in the
discussion of goals.  This is very important for business applications of
web services.  Is it contained in some goal without being made explicit?
Will it reappear at the requirments level?  Have I possibly just missed it
in the blizzard of email?  Is there something that should be added to the
goals with this in mind?

Surely the subject is in scope -- isn't it???