code: protected static String getCalendarString(String calendarModel) {
  		switch (calendarModel) {
  		case TimeValue.CM_GREGORIAN_PRO:
  			return "Gregorian";
  		case TimeValue.CM_JULIAN_PRO:
  			return "Julian";
  		default:
  			return calendarModel;
  		}
  	}
docs: Returns a human-readable string representation of a reference to a
  calendar model that is used for a time value. Known calendars (such as
  proleptic Gregorian calendar) are replaced by short English names. The
  term "proleptic" is omitted.
  
  @param calendarModel
  the calendar model item's IRI
  @return a string representation of the calendar model