issue in url production in CSS 21 CR doc.

Hi,
In [1], the url production is as follow:

url		([!#$%&*-~]|{nonascii}|{escape})*

However *-~ contains \, conflicting with {escape} so the right definition 
should be ([!#$%&*-\[\]-~]|{nonascii}|{escape})*
Cheers,

[1] http://www.w3.org/TR/CSS21/grammar.html
-- 
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         ~~Yves