Does rdflib.plugins.sparql have any facilities for doing transforms?   I've 
tried to figure this out, but I cannot quite see the right way to do it.
It looks like it ought to be possible, but the documentation doesn't quite 
get me there.

I can prepare a query and print the query algebra:

     query = prepareQuery(querytext)
     query.algebra

I also see that there is a function rdflib.plugins.sparql.algebra.traverse, 
but I'm not quite sure how to transform a query with that.

A simple example would be great.

Also, if there's anyway to do a transformation on the SPARQL syntax tree 
separate from the algebra, that would be great too.

Thanks,

-Dan


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