From: John H. Jenkins (jenkins@apple.com)
Date: Mon Nov 17 2008 - 11:13:51 CST
On Nov 17, 2008, at 6:35 AM, Julian Bradfield wrote:
> The Unicode Book describes the criteria for Han unification in terms
> of a "two-level classification". Unfortunately, it doesn't explain
> what the "two-level" means - does it mean the two dimensions of
> abstract and actual shape, or does it mean that the ideograph
> component tree is only examined for the top two levels?
>
> In particular, I don't understand the 6th row of Table 12-5.
> Why do the characters have the same abstract shape, when one has a
> Claw radical and the other doesn't - they even have different indexing
> radicals.
The "two-level classification" has to do with the three-axis model
and, as you surmise, means that the analysis of the y- and z-axes are
used.
As for the two characters in row six of Table 12-5 (U+70BA and U+7232,
which both, BTW, have the same indexing radical, as they're both found
under the fire radical), they're probably not the best example since
they're separately encoded, owing to the source separation rule, if
nothing else. And, arguably, they have a different abstract shape,
too. They are, however, treated as z-variants in CCCII. Probably the
best thing to do is to simply ignore the example because it's a bad
one. In fact, just ignore Table 12-5 altogether because it really
isn't making a clear point.
A better pair of characters with the same abstract shape but different
actual shape would be U+8AAA and U+8AAC. (They're separated because
of the source-separation rule.)
=====
John H. Jenkins
jenkins@apple.com
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