On Thu, 15 Mar 2007, Ólafur Guðmundsson /DNSEXT co-chair wrote:
Proposed change: RFC3597 trumps RFC403x NSEC and RRSIG should be removed from the list of types to apply DNSSEC canonical down casing name rules to domain names in RDATA.
...
WG Actions: DNSSEC-bis-updates will reflect this change as soon a possible
Done. Section 4.4 (Errors in Canonical Form Type Code List) has been moved up to Section 2 and expanded to cover NSEC and RRSIG.
-- Sam