From: Urs Holzer <urs@andonyar.com>

Date: Fri, 24 Jul 2009 11:41:24 +0200

To: www-math@w3.org

Message-Id: <200907241141.24410.urs@andonyar.com>

Date: Fri, 24 Jul 2009 11:41:24 +0200

To: www-math@w3.org

Message-Id: <200907241141.24410.urs@andonyar.com>

Hi together I have to implement the following in my Presentation MathML editor: When the user inserts a unicode character, the editor has to guess which token element to use, mi or mo. So, the question is: How to find a sane default token element for a given unicode character? I hoped that the Unicode character database would help. However, I am not able to get that right. At the moment I do it like that: For characters in the general category Punctuation and Symbol, I use mo. For Punctuation, this might be correct. But for Symbol it is cerainly not. For example, ∞ (U+221E INFINITY) is in category Sm (i.e. Symbol) but it is an identifier. On the other hand, ⇔ (U+21D4 LEFT RIGHT DOUBLE ARROW) is as well in the category Sm, but it is an operator. I also tried to get the information from http://www.unicode.org/Public/math/revision-11/MathClassEx-11.txt which comes along with the technical report 25 http://www.unicode.org/reports/tr25/ Unfortunately, I do not understand what they mean by the class N. It contains for example ∞ (U+221E INFINITY) and !, that is, it contains some operators and some identifiers. So now I know as much as before. Any ideas? Greetings UrsReceived on Friday, 24 July 2009 09:42:04 UTC

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