[css3-syntax] UNICODE-RANGE production rule

Hello,

I think that the production rule for UNICODE-RANGE in 
http://www.w3.org/TR/css3-syntax/#tokenization should have the first 
question mark stripped. That is, instead of

     UNICODE-RANGE     ::=     "U+" [0-9A-F?]{1,6} ('-' [0-9A-F]{1,6})?

it should be

     UNICODE-RANGE     ::=     "U+" [0-9A-F]{1,6} ('-' [0-9A-F]{1,6})?

Regards,
     Slaven