Re: forbiddenCharacters data category - related to [ACTIOn-189]

On 27.8.2012 17:52, Yves Savourel wrote:

>> Why you can't use something like 
>> allowedCharacters="[ --[<>:"\\/|\?*]]"
> 
> I have only one last reserve: currently the syntax we define does not
> allow for nested character class subtraction (trying to keep thing
> interoperable) how would you specify [\u0000-\u001F<>:"\\/|\?*]
> without such construct?

If you want to avoid constructs like [A-[B]] then you can in this case
split range &#x20;-&#x1ffff; into several smaller ranges which will be
ending before and starting after disallowed characters.

But I don't think we should disallow [A-[B]] as this syntax is available
in XML Schema nad XPath 2.0/XQuery 1.0 -- there are plenty of existing
implementations around.

Moreover other languages offer similar syntax. For example in Java you
can map this to [A&&[^B]] if I'm not mistaken.

> Overall, I'd much rather go with allowedCharacter with regex than
> forbiddenCharacters without regex.

+1

   Jirka

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