SOA and NS are canonical records?

[Christian Smith]

In article <c79ab4$20ur$1 at sf1.isc.org>, "June" <nfbz2003 at yahoo.com> 
wrote:

> thanks for the reply.
> 
> Is there any reference says SOA and NS RRs both are canonical names? Or all
> RRs, except CNAME (alias), are canonical names, by definition?

In a CNAME record, the left side is the "alias" and the right side is 
the canonical name.

Grab you local Websters/Oxford's and look up "canonical".

With an SOA and an NS record, the left side is always a canonical name.

In an NS record the right side is also a canonical name.

Obviously the right hand side of an SOA is neither a canonical name nor 
an alias.