> Does this mean:
> 
> A: All implementations that conform to this document should prefer the
>    NTA over the positive anchor in such a case, or
> B: This is implementation-dependent, but if an implementation allows
>    the coexistence of positive and negative anchors, it should prefer
>    the NTA, or
> C: something else?

Good point.  I personally favor A, but would be fine with B.

I'd be interested in input from other implementors; if there's a
constituency for B then fine, but if we're all going to allow
coexistence anyway, we might as well specify it that way.

> I don't have a strong opinion between A and B, but I'd like this
> document to be clear on this.  And, if it means A, I'd use an RFC2119
> keyword (it's probably a SHOULD).

With respect to the precedence rule, I would use MUST rather than SHOULD.

-- 
Evan Hunt -- e...@isc.org
Internet Systems Consortium, Inc.

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