media queries syntax

Hi,
I am looking at the media-queries CR document [1], form a CSS Validator 
standpoint, and I am wondering why the syntax of expression is
'(' .. ')' instead of using a function name like 'feature(' ... ')'.

Changing the parser in one place, for handling media-queries is one thing, 
but adding support for '('..')' introduce lots of new error handling in 
other part of the spec for errors like
color: rgb (1,2,3); (instead of rgb(1,2,3);)

plus 'feature(...)' seems more readable than '(..)' (but that's subjective 
:) ).


[1] http://www.w3.org/TR/2009/CR-css3-mediaqueries-20090915/

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Baroula que barouleras, au tiéu toujou t'entourneras.

         ~~Yves