public SparqlQueryGenerator(ISelectBuilder selectBuilder)
{
SelectedVariables = new List <SparqlVariable>();
CoalescedVariables = new Dictionary <SparqlVariable, SparqlExpression>();
SelectBuilder = selectBuilder;
#if NET35
QueryBuilder = selectBuilder.GetQueryBuilder();
PatternBuilder = QueryBuilder.RootGraphPatternBuilder;
#else
QueryBuilder = SelectBuilder;
PatternBuilder = QueryBuilder.Root;
#endif
}