CustomHeaders.fromXml constructor
      
      CustomHeaders.fromXml(
    
    
- XmlElement elem
Implementation
factory CustomHeaders.fromXml(_s.XmlElement elem) {
  return CustomHeaders(
    quantity: _s.extractXmlIntValue(elem, 'Quantity')!,
    items: _s.extractXmlChild(elem, 'Items')?.let((elem) => elem
        .findElements('OriginCustomHeader')
        .map((c) => OriginCustomHeader.fromXml(c))
        .toList()),
  );
}