> On 8 Feb 2018, at 9:43 am, Mark Andrews <ma...@isc.org> wrote:
> 
> Software that processes CAA records returned by the DNS can remove
> any duplicates detected at that level of processing. The DNS isn’t
> in a position to do that de-duplication.
> 
> For UPDATE I would always delete the CAA RRset and re-add it to
> update it rather than do it at the RR level.
> 
> I believe the current RFC is enough for the records to be interpreted
> correctly if you don’t violate the SHOULD NOT.  I don’t believe that
> they ever will contain values that violate that SHOULD NOT except in
> test suites.

Additionally any record that can’t be represented in the canonical form
can be presented in unknown record format.  This will handle tags that
violate the SHOULD NOT.

> -- 
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742              INTERNET: ma...@isc.org
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: ma...@isc.org

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