func (delivery *SIRIEstimatedTimetableDelivery) BuildEstimatedTimetableDeliveryXMLRaw() (string, error) {
    var buffer bytes.Buffer
    if err := templates.ExecuteTemplate(&buffer, "estimated_timetable_delivery_raw.template", delivery); err != nil {
        logger.Log.Debugf("Error while executing template: %v", err)
        return "", err