code: def _transientSchedule(self, when, now):
          
          if self.store.parent is not None:
              subStore = self.store.parent.getItemByID(self.store.idInParent)
              hook = self.store.parent.findOrCreate(
                  _SubSchedulerParentHook,
                  subStore=subStore)
              hook._schedule(when)
docs: If this service's store is attached to its parent, ask the parent to
          schedule this substore to tick at the given time.
  
          @param when: The time at which to tick.
          @type when: L{epsilon.extime.Time}
  
          @param now: Present for signature compatibility with
              L{_SiteScheduler._transientSchedule}, but ignored otherwise.