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In response to

> What is the output of this query if no solutions satisify the WHERE clause?
> An empty solution set or a solution set with a single solution having a
> binding of 0^^xsd:integer?
> PREFIX : <http://example/>
> SELECT (SUM(?lprice) AS ?totalPrice)
>   ?book :price ?lprice .
> }
> GROUP BY ?book

An empty solution set.

Please indicate whether this response has answered your query.

Steve, on behalf of the SPARQL Working Group