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Re: issue with url() in CSS 2.1 grammar

From: Bjoern Hoehrmann <derhoermi@gmx.net>
Date: Fri, 27 Jun 2008 14:11:37 +0200
To: Daniel Glazman <daniel.glazman@disruptive-innovations.com>
Cc: "www-style@w3.org" <www-style@w3.org>
Message-ID: <isl964pr2rkc37bp41ghmr5l8iiivi6jib@hive.bjoern.hoehrmann.de>

* Daniel Glazman wrote:
>According to CSS 2.1 grammar [1], a |URI| token is formed this way:
>
>   "url("{w}{string}{w}")"   {return URI;}
>   "url("{w}{url}{w}")"      {return URI;}
>
>where |url| is
>
>   url         ([!#$%&*-~]|{nonascii}|{escape})*
>
>Please note the |*| at the end of that line...
>That means the following is a perfectly valid CSS 2.1 rule :
>
>   @namespace url();
>
>where the parsing should produce an empty (length 0) url token !

The empty string is a valid resource identifier, if it somehow causes
problems in @namespace, then the css3-namespace specification should
define that the @namespace rule is invalid in the case above. What am
I missing?

>I recommend changing that |*| into a |+|...
>
>[1] http://www.w3.org/TR/CSS21/grammar.html#scanner

This would have to be changed in the core syntax first and then there,
as @namespace is not allowed in CSS 2.1 to begin with. But we are not
really supposed to change the core syntax at all...
-- 
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
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Received on Friday, 27 June 2008 12:38:59 GMT

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