docs: public void parse (final int nYear, final HolidayMap aHolidayMap, final Holidays aConfig)
    {
      for (final RelativeToEasterSunday aDay : aConfig.getRelativeToEasterSunday ())
      {
        if (!isValid (aDay, nYear))
          continue;
        final ChronoLocalDate aEasterSunday = getEasterSunday (nYear, aDay.getChronology ());
        aEasterSunday.plus (aDay.getDays (), ChronoUnit.DAYS);
        final String sPropertiesKey = "christian." + aDay.getDescriptionPropertiesKey ();
        addChrstianHoliday (aEasterSunday,
                            sPropertiesKey,
                            XMLHolidayHelper.getType (aDay.getLocalizedType ()),
                            aHolidayMap);
      }
    }