PREFIX ex: <http://example.org/ex#>
EXPLAIN SELECT $number $name (3 + $number) AS foo COUNT(*) AS bar
FROM <data.rdf>
WHERE {
 $r a ex:Class ;
    ex:numPred $number ;
    ex:stringPred $name .
    FILTER ($number < 10 && $name != "foo")
}
GROUP BY $name ORDER BY $number