[dns-operations] NXDOMAIN vs NODATA for suffixes of existing name

[Florian Weimer]

* Edward Lewis:

> RFC 1034, 4.3.2, step 3, part c, 2nd paragraph, 2nd sent.:
>
> "If the name is original, set an authoritative name error in the
> response and exit."

I don't think this part of the algorithm is reached in my example.
See the first graf of part c:

| If at some label, a match is impossible (i.e., the corresponding
| label does not exist), look to see if a the "*" label exists.

Apparently, the issue boils down to the question whether the label "b"
exists under example.net. if there are are records for
a.b.example.net.  I think it does (and BIND 9 happens to agree with
me, although this behavior changed in the past IIRC), but I can't find
a definite reference.