W3C home > Mailing lists > Public > www-style@w3.org > February 2009

Re: Unicode Normalization

From: Andrew Cunningham <andrewc@vicnet.net.au>
Date: Fri, 06 Feb 2009 11:27:30 +1100
Message-ID: <498B83F2.6050806@vicnet.net.au>
To: Robert J Burns <rob@robburns.com>
CC: Jonathan Kew <jonathan@jfkew.plus.com>, Benjamin Blanco <benjo316@gmail.com>, Anne van Kesteren <annevk@opera.com>, Aryeh Gregor <Simetrical+w3c@gmail.com>, public-i18n-core@w3.org, W3C Style List <www-style@w3.org>

Robert J Burns wrote:
> I hadn't thought of that, but you're probably right. However this is 
> either 1) a variation on the same bug I described earlier or 2) a font 
> that is old and not yet updated to support U+3008 and U+3009. Again, 
> an updated font, if it supports a particular character, should support 
> all of canonically equivalent characters for that character since it 
> does not require producing another glyph, but simply adding a mapping 
> for an already designed glyph to another character (or character 
> sequence).
why would U+3008 and U+3009 share the same glyph shape as the 
canonically equivalent characters? Not sure this is necessary, nor even 
desirable in many contexts. But harmonising typographic design within 
multi script fonts can be problematic at the least. One of the reasons 
its better to use appropriate fonts for the language and contents of a 

The shape of each glyph is a design consideration by the font developer 
base don the context of its usage.

I'd assume the designer would develop the glyph and its metric to suit 
its usage, and harmonise with the script it is most likely to be used with.

The characters may be canonically equivalent, but this does not mean 
that they need to be visually identical or share a glyph.

For instance: a font may use the same glyph for <U+0065 U+0302 U+0301> 
and <U+1ebf>. Alternatively it may use different glyphs for each. It 
hinges on the intention of the font's designer and their intended 
audience and use of the font.

But then a well designed font (intended for generic use of Latin script 
languages) will have more than one glyph available for the character 

Andrew Cunningham
Senior Manager, Research and Development
State Library of Victoria
328 Swanston Street
Melbourne VIC 3000

Ph: +61-3-8664-7430
Fax: +61-3-9639-2175

Email: andrewc@vicnet.net.au
Alt email: lang.support@gmail.com


Received on Friday, 6 February 2009 00:29:02 UTC

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