What is the current Unicode stance on subscripts and superscripts for mathematical use?
John Hudson
john at tiro.ca
Mon Jun 22 16:10:32 CDT 2020
On 22062020 11:34 am, Doug Ewell wrote:
> So, does that mean you don't think L2/18-206 will fly?
Has it shown any signs of flying in the past two years? or am I being
trolled? :)
I'll bite:
That document is targeting issues in general typographic display
variants and muddies the character/glyph distinction. Most of what it
calls for are clear cases of typographic glyph processing, e.g.
smallcaps as variants of uppercase characters. In that respect, it at
once goes too far in calling for smallcap encoding for a large number of
existing uppercase characters and not nearly far enough in ignoring vast
numbers of existing characters outside the small European subset
identified in the document.
The author seems also not to understand that existing 'small capitals'
in Unicode are not typographic smallcap variants but distinct letters in
some phonetic notation systems.
The author is not wrong to point out that the existence of some super-
and subscript characters in Unicode doesn't always play well with font
and algorithmic display of additional characters with super- and
subscript styling: size, weight, and alignments can vary, depending on
the path from the encoded characters to the styled display, how well the
font has been made, and what algorithms are used. But these problems are
not solved by encoding a bunch of additional super- and subscript
characters. The problems may be pushed further out — at least for
European users of the Latin script — but not solved.
Mathematical notation is a different case: a specialised writing system
in which style, size, and relative position all have semantic meaning.
It needs a different model for both encoding and layout than typical
language text and typography.
J.
--
John Hudson
Tiro Typeworks Ltd www.tiro.com
Salish Sea, BC tiro at tiro.com
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