L2/09-297

From: Mark Davis
Date: Thu, Aug 13, 2009 at 16:58
Subject: Simplifying D131

The current definition of D131 is more complicated than it
need be, given that we have the new NFKC_CaseFold property.
The current text is:

D131 A string X is a compatibility caseless match for a
string Y if and only if:
NFKD(toCasefold(NFKD(toCasefold(NFD(X))))) =
NFKD(toCasefold(NFKD(toCasefold(NFD(Y)))))

With the new property, it can be:

D131 A string X is a compatibility caseless match for
a string Y if and only if:
NFKC_CaseFold(X) = NFKC_CaseFold(Y)

Note: this does have slightly different extent than the previous
definition, since it also ignores default ignorable characters.
So the committee should consider that issue.

Mark