From: Eric Muller (firstname.lastname@example.org)
Date: Thu Aug 23 2007 - 11:27:18 CDT
Ginette Beurton wrote:
> For example, u03AF is not declared as an equivalent of u1F71. So the
> relation between the 2 codes is not symmetric.
Actually, the interesting relation is symmetric (well, for 03A*C* and 1F71).
What you see in the code charts is this:
- U+03AC ά GREEK SMALL LETTER ALPHA WITH TONOS
- U+1F71 ά GREEK SMALL LETTER ALPHA WITH OXIA
(decomposes to) U+03AC ά GREEK SMALL LETTER ALPHA WITH TONOS
The last line records the canonical decomposition *mapping* of U+1F71
into <U+03AC>, and there is indeed no corresponding canonical
decomposition mapping of U+03AC.
But the decomposition mappings are only building blocks for the notion
you are looking for, which is canonical *equivalence*. In other words,
the decomposition mappings are not too interesting in themselves, what
matters is whether two strings are canonically equivalent and the
strings <03AC> and <1F71> are canonically equivalent. UAX 15
(<http://www.unicode.org/reports/tr15/>) has all the details.
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