TTL on DS records

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Section 5 of RFC 4034 says:

   The DS RR has no special TTL requirements.

While RFC 4035 Section 2.4 says:

   The TTL of a DS RRset SHOULD match the TTL of the delegating NS RRset

Due the "SHOULD" I'm not sure this is worthy of an errata, but seems =
rather unfortunate.

Apologies if this is a previously known issue.

DW



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