func (delivery *XMLNotifyEstimatedTimetableDelivery) EstimatedJourneyVersionFrames() []*XMLEstimatedJourneyVersionFrame {
    if delivery.estimatedJourneyVersionFrames == nil {
        estimatedJourneyVersionFrames := []*XMLEstimatedJourneyVersionFrame{}
        nodes := delivery.findNodes("EstimatedJourneyVersionFrame")
        for _, node := range nodes {