From: Otto Stolz (Otto.Stolz@uni-konstanz.de)
Date: Tue Oct 02 2007 - 08:05:54 CST
Hello Дмитры Турин,
you wrote:
> I seek attentively, so i think,
> that bracket "stanket" (stand for egg) is __really necessary__
> http://unicode2.euro.ru/site/unicode2/en/author/convert_eng.htm
> especially because cognitive dissonance between brackets,
> existing in Unicode now.
If you can provide examples of these brackets being used in running
text, e. g. in math textbooks, then go ahead and make a formal pro-
position, cf. <http://www.unicode.org/pending/proposals.html>.
If you, however, just think that your new character maybe useful
or even indispensable, then you are probably out of luck. The UTC
is aparently devoted to encode existing characters and not desirable
ones.
> PC> U+2329 LEFT-POINTING ANGLE BRACKET
> PC> U+232A RIGHT-POINTING ANGLE BRACKET
> PC> U+3008 LEFT ANGLE BRACKET
> PC> U+3009 RIGHT ANGLE BRACKET
...
> (1) But what is the visual difference between these pairs of brackets ?
None; they are (pairwise) canonically equivalent.
Hence, rather 27E8 and 27E9 should be used in mathematical
expressions.
> PC> U+3014 LEFT TORTOISE SHELL BRACKET
> PC> U+3015 RIGHT TORTOISE SHELL BRACKET
> PC> U+3018 LEFT WHITE TORTOISE SHELL BRACKET
> PC> U+3019 RIGHT WHITE TORTOISE SHELL BRACKET
> PC> U+301A LEFT WHITE SQUARE BRACKET
> PC> U+301B RIGHT WHITE SQUARE BRACKET
> Very simple to each other, there is no _enough_ difference.
The glyphs shown in the standard are not meant to be prescriptive.
Read <http://www.unicode.org/versions/Unicode5.0.0/ch17.pdf>.
In many cases, characters with similar glyphs differ in
their respective usage, hence in their formal character properties.
Cf. <http://www.unicode.org/ucd/>.
> PC> U+300A LEFT DOUBLE ANGLE BRACKET
> PC> U+300B RIGHT DOUBLE ANGLE BRACKET
> Some of them are not bracket in russian.
Unicode is not confined to Russian users, is it?
Particularly these ones are meant to be used by Chinese, Japanese,
and Korean users.
> (2) What is the visual difference between them and 27ea,27eb ?
> Only by purpose ?
300A and 300B are CJK punctuation, 27EA and 27EB are mathematical brackets.
The visual difference is that CJK symbols and punctuation normally are
placed in a square cell, whilst the spacing of mathematical symbols is subject
to mathematical typeset rules; re-read <http://www.unicode.org/notes/tn28/>.
Best wishes,
Otto Stolz
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