Federated query result format

[Roshan Bharath Das]

Hello,

How can I decide to get the query result format for a sparqlService in JSON for 
example?.

Below is my code:
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.sparqlService(linkedmdb,query);
ResultSet result = qe.execSelect();
The result is in XML format and I want it to be in JSON format. 

Best Regards,
Roshan