xi2.addNewChild("days", days);
if (hours != null)
xi2.addNewChild("hours", hours);
if (minutes != null)
xi2.addNewChild("minutes", minutes);
xi2.addNewChild("volume", volName);
if (whichHours != null)
xi2.addNewChild("which-hours", whichHours);
if (whichMinutes != null)
xi2.addNewChild("which-minutes", whichMinutes);