Quoting Andrew Pam on Friday October 04, 2002:
| On Fri, Oct 04, 2002 at 06:31:59PM +1000, Stephen Rothwell wrote:
| > There is no technical need to tell the registry if the name servers
| > are not in the domain.  The only thing the parent NS needs to know
| > in this case is the NAME of the name servers (because they can be looked
| > up using the DNS).
| 
| That doesn't work:
| 
| http://cr.yp.to/djbdns/notes.html#gluelessness

That only describes a corner case where there is a loop. If you set up
such a loop, you're an idiot :) Some registries will allow you to
nominate glue if you think you'll have that problem.

kim