> Where am I going with this? Basically what I'm after is a clean/clear
> way to tell if quotation marks and parentheses (plus the other
> bracketing characters such as '[' or '{' are opening or closing
> punctuation. That's the real question here! How would you do that
> using properties and categories?Basically you just cannot do that. An explicit counterexample given in Version 3.0 page 152 is: �French� �Slovenian� � can be both opening and closing. � can be both opening and closing.
