'FILTER' '(' Expression ')'

"{ ?p ?s ?o FILTER ?x = q:name () ?p ?o2 }" was ambiguous so AndyS,
DaveB, SteveH, and Jeen decided we'd put parens around the filter
expression. AndyS proposed an exception for FILTER (REGEX(?a, ?b)) but
the rest of us dragged our feet.

example test: 

http://www.w3.org/2005/01/yacker/uploads/sparqlTest?lang=perl&text=PREFIX+%3A++%3Chttp%3A%2F%2Fexample.org%2Fns%23%3E+%0D%0ASELECT+*%0D%0A%7B+OPTIONAL+%7B+%3Aa+%3Ab+%3Ac+%7D+.+%3Fx+%3Fy+%3Fz+FILTER+%28%3Fx+%3C+%3Fy%29+%7D%0D%0A&action=validate+text

-- 
-eric

office: +81.466.49.1170 W3C, Keio Research Institute at SFC,
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cell:   +81.90.6533.3882

(eric@w3.org)
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