On Sunday, 5 January 2020 01:14:17 UTC Michael StJohns wrote:
> ...
> 
> 1) A recommendation for the maximum size of the zone (and for that
> matter the maximum churn rate). This is hinted at in the abstract, but
> missing from the body of the document.
> 2) ...
> 3) ...
> ...
> I think Experimental is fine.  I'm not sure without a clear text
> addressing my points 1,2, 13 and 15 that this is useful as a standards
> track document for general use.

i agree, and especially regarding point 1. without a block hash technique 
whereby the zonemd can be incrementally updated upon receipt of changes by 
UPDATE and IXFR (in some canonical form so that such updates are the same 
regardless of the source of the change which may be UPDATE, IXFR, or other), 
there is a broad spectrum of zone sizes and churn rates for which ZONEMD as 
specified is not applicable.

these limits should be described, and the above block hash methodology should 
be hinted at as "for future work, to eliminate those limitations."

-- 
Paul


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