NamespaceURI property
      
      String?
      get
      NamespaceURI
      
    
    
    
Implementation
String? get NamespaceURI {
  for (final namespaces in _namespaces) {
    if (namespaces.containsKey(Prefix)) {
      return namespaces[Prefix];
    }
  }
  for (final namespaces in _namespaces) {
    if (namespaces.containsKey("xmlns")) {
      return namespaces["xmlns"];
    }
  }
  return null;
}