func (r Rule) validateNoncurrentTransition() error {
	return r.NoncurrentVersionTransition.Validate()
}

// GetPrefix - a rule can either have prefix under <rule></rule>, <filter></filter>
// or under <filter><and></and></filter>. This method returns the prefix from the
// location where it is available.
func (r Rule) GetPrefix() string {
	if p := r.Prefix.String(); p != "" {
		return p
	}
	if p := r.Filter.Prefix.String(); p != "" {

	}
	for _, rule := range lc.Rules {
		if rule.Status == Disabled {
			continue
		}

		if len(prefix) > 0 && len(rule.GetPrefix()) > 0 {
			// we can skip this rule if it doesn't match the tested
			// prefix.
			if !strings.HasPrefix(prefix, rule.GetPrefix()) && !strings.HasPrefix(rule.GetPrefix(), prefix) {
				continue
			}
		}

		if rule.NoncurrentVersionExpiration.NoncurrentDays > 0 {
			return true
		}