Sometimes such references are non-goals ...
> (What would a namespace not strongly connected to the rest
> be like? Sort of like colors of the ultraviolet?)
... like when you set up an isolated network with its own DNS
root server and hierarchy, to test a network configuration
with new software that you dare not let out. Hmm, virus tests
in a Class IV containment environment? UV decontamination
may not be good enough! ;-)
Seriously -- don't assume connectivity is always a goal.
- Dave