code: @Nonnull
    public CalendarIntervalScheduleBuilder withIntervalInSeconds (final int intervalInSeconds)
    {
      _validateInterval (intervalInSeconds);
      m_nInterval = intervalInSeconds;
      m_eIntervalUnit = EIntervalUnit.SECOND;
      return this;
    }
docs: Specify an interval in the IntervalUnit.SECOND that the produced Trigger
  will repeat at.
  
  @param intervalInSeconds
  the number of seconds at which the trigger should repeat.
  @return the updated CalendarIntervalScheduleBuilder
  @see ICalendarIntervalTrigger#getRepeatInterval()
  @see ICalendarIntervalTrigger#getRepeatIntervalUnit()