[Dovecot] Not understanding namespaces

[Stewart Dean]

I have been diligently reading about namespace in the DC doc and what I 
can find in Google.  Like the blind men and the elephant, I see the 
nature of some individual bits of namespace, some syntax and the overall 
purpose (overriding defaults and providing extensions), but I don't see 
the whole thing and how it is used. 
I am looking to do some maildir testing in what is a mbox default 
system, so I thought to employ namespace to do so.
I see that namespace(s) can be defined in dovecot.conf and I see that it 
can be defined in TBird (under ServerSettings, Advanced Account 
Settings), but it isn't clear to me how they are made to work together.  
Some questions:

- Is it that you can define multiple namespaces in dovecot.conf and then 
specify which of these you use in the TBird server settings?
- What is the syntax of the TBird namespace specification?

-- 
==== Once upon a time, the Internet was a friendly, 
neighbors-helping-neighbors small town, and no one locked their doors. 
Now it's like an apartment in Bed-Stuy: you need three heavy duty 
pick-proof locks, one of those braces that goes from the lock to the 
floor, and bars on the windows.... ==== Stewart Dean, Unix System Admin, 
Bard College, New York 12504 sdean at bard.edu voice: 845-758-7475, fax: 
845-758-7035