if !n.set {
		return nil
	}
	if n.StorageClass == "" {
		return errXMLNotWellFormed
	}
	return nil
}

// NextDue returns upcoming NoncurrentVersionTransition date for obj if
// applicable, returns false otherwise.
func (n NoncurrentVersionTransition) NextDue(obj ObjectOpts) (time.Time, bool) {
	if obj.IsLatest || n.StorageClass == "" {
		return time.Time{}, false
	}

	if de.Empty() {
		return nil
	}

	type delMarkerExpiration DelMarkerExpiration
	return enc.EncodeElement(delMarkerExpiration(de), start)
}

// NextDue returns upcoming DelMarkerExpiration date for obj if
// applicable, returns false otherwise.
func (de DelMarkerExpiration) NextDue(obj ObjectOpts) (time.Time, bool) {
	if !obj.IsLatest || !obj.DeleteMarker {
		return time.Time{}, false
	}

}

// IsNull returns true if both date and days fields are null
func (t Transition) IsNull() bool {
	return t.StorageClass == ""
}

// NextDue returns upcoming transition date for obj and true if applicable,
// returns false otherwise.
func (t Transition) NextDue(obj ObjectOpts) (time.Time, bool) {
	if !obj.IsLatest || t.IsNull() {
		return time.Time{}, false
	}

	if !t.IsDateNull() {

					break
				}
			}
		}

		// DelMarkerExpiration
		if obj.IsLatest && obj.DeleteMarker && !rule.DelMarkerExpiration.Empty() {
			if due, ok := rule.DelMarkerExpiration.NextDue(obj); ok && (now.IsZero() || now.After(due)) {
				events = append(events, Event{
					Action: DelMarkerDeleteAllVersionsAction,
					RuleID: rule.ID,
					Due:    due,
				})
			}

			}

			if tc.obj.IsLatest {
				if expectedDue, _ := lc.Rules[tc.transRuleID].Transition.NextDue(tc.obj); !strings.Contains(transHdrs[0], expectedDue.Format(http.TimeFormat)) {
					t.Fatalf("Test %d: Expected transition time %s", i+1, expectedDue)
				}
			} else {
				if expectedDue, _ := lc.Rules[tc.transRuleID].NoncurrentVersionTransition.NextDue(tc.obj); !strings.Contains(transHdrs[0], expectedDue.Format(http.TimeFormat)) {