Auto-generated SPARQL Algebra expressions for the algebra test suites

Attached is a first shot at a script which serializes parsed SPARQL back
into Algebra expressions similar to the (informative) syntax used in the
specification.  I have only eyeballed it, but some caveats:

* It doesn't serialize FILTERs
* The parser breaks up triple patterns in a BGP into Joins against each
triple pattern

So:  BGP([(?s,?p,?o),(?s2,?p2,?o2)]
becomes: Join(BGP([(?s,?p,?o),]),BGP([(?s2,?p2,?o2)])

Otherwise, everything else should be okay.  I wanted to make sure this
is what we have in mind and that the expressions being generated are not
malformed before turning it loose on the entire test collection.

-- 
Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
ogbujic@ccf.org


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