Legal redelegation method?

[Chris De Young]

Hi,

This is more of a DNS spec question than a question specific to bind;
I apologize if this isn't the right forum for such.  (If that's the
case, pointers to the right place would be welcome.)

Is it legal in DNS to re-delegate an entire zone for which one is
authoritative, as opposed to a subdomain of it?

For example, let's say that I am authoritative for arizona.edu (which
I am).  I've delegated a subdomain off to another nameserver:

;
$origin hacks.arizona.edu.
@                       in      ns      hacks.arizona.edu.
@                       in      a       150.135.84.2
;

Is it legal for the nameserver at 150.135.84.2 to be configured with
"hacks.arizona.edu" as a master zone, but then in the zone file have
only an SOA record and NS records, the intent being to delegate it to
someone else?

Or is this something that must be done from the parent
("arizona.edu")? 

Thanks much!
-Chris
chd at arizona.edu