private List<String> extractIntervalRange(FacetMemberInterval interval){
  List<String> range=new ArrayList<>();
  range.add(interval.getLowerBound());
  range.add(interval.getUpperBound());
  return range;
}

private List < String > extractIntervalRange ( FacetMemberInterval interval ) { List < String > range = new ArrayList < > ( ) ; range . add ( interval . getLowerBound ( ) ) ; range . add ( interval . getUpperBound ( ) ) ; return range ; }
return interval range as a list
