rq25 aggregate functions

Hi all,

I've just added the text on aggregate functions to http://www.w3.org/2009/sparql/docs/query-1.1/rq25.xml#aggregateFunctions

The main new content is a new definition of Aggregation, to match the  
groups intentions for the use of aggregate functions, and definitions  
for COUNT, SUM, MIN, MAX, AVG, GROUP_CONCAT, and SAMPLE.

The notation around “exp · μ'” in Aggregation is questionable, so  
if anyone has a better suggestion I'm all ears.

I'm hoping to put the definitions for sub-select in rq25 on Monday.

- Steve

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Steve Harris, CTO, Garlik Limited
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