Initial draft of Design:Aggregate

I've finished a first draft of the Design:Aggregate wiki.  Some work on the
Mapping to AST to algebra and test case sections is needed eventually, but I
thought what I have so far should be enough for discussion on Tuesday.

I have a sketch for the aggregate operator semantics attached (I wasn't able
to figure out the math syntax for our Mediawiki instance - any information
on this would be useful)

http://www.w3.org/2009/sparql/wiki/Design:Aggregate

----------------------
Chimezie (chee-meh) Thomas-Ogbuji
Heart and Vascular Institute (Clinical Investigations)
Cleveland Clinic (ogbujic@ccf.org)
Ph.D. Student Case Western Reserve University
(chimezie.thomas-ogbuji@case.edu)


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