glue record question

[Joel Uckelman]

Quoth Marc Storck:
> This is a multi-part message in MIME format.
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> yes you can only use ONE SINGLE name per IP for glue records!!!
> 
> ns.example.foo. IN A 192.0.0.1 ns.example.foo OR ns.example.bar
> 
> you have to choose one name!!!!
> 
> Marc

Why, though? If the A records are held by root servers for two different 
TLDs, what sort of problem does this cause?

-- 
J.