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);