RE: numeric properties of Nl characters in the UCD

From: Peter Constable (petercon@microsoft.com)
Date: Tue Nov 25 2003 - 13:04:09 EST

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From: unicode-bounce@unicode.org [mailto:unicode-bounce@unicode.org] On
Behalf Of Arcane Jill

> Actually, I don't understand why UnicodeData.txt has no less than
three different
> fields for numerical value anyway...

Not all characters representing numbers are digits. Not all characters
representing digits are decimal digits.

A character can have (e.g.) a numeric value property, but not a digit
value property; e.g. 09F4 BENGALI CURRENCY NUMERATOR ONE. A character
can have a digit value property but not a decimal digit value property;
e.g. 217D SMALL ROMAN NUMERAL ONE HUNDRED.

What *cannot* happen is for a character to have different non-null
values for the various number-related properties.

Peter

Peter Constable
Globalization Infrastructure and Font Technologies
Microsoft Windows Division

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Maybe in reply to: Philippe Verdy: "numeric properties of Nl characters in the UCD"
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