/**
  * Returns a list of variable bindings satisfying a SPARQL query. Just a pass-through to the back
  * end because I'm lazy.
  *
  * @param query the SPARQL query
  * @return a list of variable bindings satisfying the SPARQL query
  * @throws SADIException
  */
 protected List<Map<String, String>> executeQuery(String query) throws SADIException {
   return backend.executeQuery(query);
 }