L2/01-196

> Case Mapping, and Greek Final
> From: Mark Davis
> Date: 2001-03-24
>
> Various people (Carl Brown, Nick Nickolas) have brought to our attention
> that the Special casing property for the Greek Sigma needs to be enhanced.
> Here is a proposal for doing that.
>
> 1. Add the following text at the appropriate point:
>
> In the following conditions, a letter is any character with general
category
> Ll or Lo, and an ignorable sequence is a sequence of *zero* or more
> characters from the set {HYPHEN, SOFT HYPHEN, general category Mn}.
>
> The FINAL2 condition is met if the character in question is not followed
by
> a sequence consisting of an ignorable sequence and a letter.
>
> The INITIAL2 condition is met if the character in question is not preceded
> by a sequence consisting of a letter and an ignorable sequence.
>
> The GREEK_FINAL condition is met if the FINAL2 condition is met and the
> INITIAL2 condition is *not* met.
>
> Change the condition for lowercasing capital sigma to the following (if
this
> rule doesn't apply, then the default sigma mapping from UnicodeData is
> used):
>
> 03A3; 03C2; 03A3; 03A3; GREEK_FINAL # GREEK CAPITAL LETTER SIGMA
>
> [There is a related document from Nick Nickolas that we should also post.]
>
> 2. Since the data for special casing is now normative, I propose that
after
> suitable review, we make http://www.unicode.org/unicode/reports/tr21/ into
a
> UAX in Unicode 3.2. We can then move some of the descriptive text on
> conditions from the data file back into the UAX where it is more
> appropriate.
>