TimeSensor

  TimeSensor { 
      exposedField SFTime   cycleInterval 1       # (0,)
      exposedField SFBool   enabled       TRUE
      exposedField SFBool   loop          FALSE
      exposedField SFTime   startTime     0       # (-,)
      exposedField SFTime   stopTime      0       # (-,)
      eventOut     SFTime   cycleTime
      eventOut     SFFloat  fraction_changed
      eventOut     SFBool   isActive
      eventOut     SFTime   time
    }