Re: [CSS21] 4.1.3 Characters and case: Number Sign (#) in identifiers

On 20 Apr 2009, at 14:15, Aryeh Gregor wrote:

> On Mon, Apr 20, 2009 at 8:57 AM, James Hopkins <james@idreamincode.co.uk 
> > wrote:
>> I just wanted to clarify whether the Number Sign (U+0023) is indeed  
>> "higher"
>> than the U+00A1 character as the spec suggests, since U+0023  
>> doesn't need to
>> be explicitly escaped.
>
> 23 is less than A1 in hexadecimal, so U+0023 is lower than U+00A1, not
> higher.  "Higher" here means "larger codepoint".
>

Thanks for the clarification regarding these particular hexadecimal  
codepoints.

Based on your feedback, my conclusion is that 4.1.3 is in this respect  
is unclear. The current spec states "... [identifiers] can contain  
only the characters [a-z0-9] and ISO 10646 characters U+00A1 and  
higher, plus the hyphen (-) and the underscore (_); they cannot start  
with a digit, or a hyphen followed by a digit. Identifiers can also  
contain escaped characters and any ISO 10646 character as a numeric  
code ..." If indeed the Number Sign is lower than U+00A1 then how can  
it be acceptable within in an identifier, without being escaped?