private void addDescriptionToEvent(Appointment appointment, PropertyList properties) {

    Reservation reservation = appointment.getReservation();
    String eventDescription;
    if (reservation
            .getClassification()
            .getType()
            .getAnnotation(DynamicTypeAnnotations.KEY_DESCRIPTION_FORMAT_EXPORT)
        != null) {
      eventDescription =
          reservation.format(
              raplaLocale.getLocale(),
              DynamicTypeAnnotations.KEY_DESCRIPTION_FORMAT_EXPORT,
              appointment);
    } else {
      eventDescription = null;
    }
    if (eventDescription != null) {
      properties.add(new Description(eventDescription));
    }
  }