public QueryExecution sparqlService(String service, Query query) {
   return virtuoso.jena.driver.VirtuosoQueryExecutionFactory.sparqlService(service, query);
 }
 public QueryExecution sparqlService(String service, Query query, String defaultGraph) {
   return virtuoso.jena.driver.VirtuosoQueryExecutionFactory.sparqlService(
       service, query, service);
 }
 public QueryExecution sparqlService(
     String service, Query query, List defaultGraphURIs, List namedGraphURIs) {
   return virtuoso.jena.driver.VirtuosoQueryExecutionFactory.sparqlService(
       service, query, defaultGraphURIs, namedGraphURIs);
 }