Comments on draft-dusseault-caldav-15 and draft-newman-i18n-comparator-14

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Hi,

I notice that draft-dusseault-caldav-15 now delegates part of the text matching semantics to draft-newman-i18n-comparator-14, which probably is a good thing. As far as I can tell, this change was made in following up to Sam H's comments in <https://datatracker.ietf.org/public/pidtracker.cgi?command=view_comment&id=55575>:

Section 9.6 contains a facility for doing substring matching on
internationalized strings but contains no discussion of normalization,
limited discussion of case folding, and no discussion of other
matching issues that have been problematic for LDAP, IMAP and other
IETF technologies.  This seems quite inadequate.  If the
internationalization community within the IETF is quite sure that this
is OK, I'll remove the discuss.  I just don't see why text matching in
caldav should be so much easier than IDN or LDAP.

But as a matter of fact, draft-newman-i18n-comparator-14 doesn't define any collations that would actually solve the Unicode NF issue, so it's not really clear how this helps CalDAV (except that it now uses a framework in which the solution may become available in the future).

Maybe the set of initial registrations in <http://tools.ietf.org/html/draft-newman-i18n-comparator-14#section-9> needs to be extended?

Best regards, Julian

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