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_di_IXMLDocument xml = NewXMLDocument();
xml->Active = true;
xml->Options = xml->Options << doNodeAutoIndent;
xml->Encoding="utf-8";
_di_IXMLNode xMessage = xml->AddChild("Message");
_di_IXMLNode xHeader = xMessage->ChildNodes->FindNode(WideString("Header"));
xHeader->AddChild("message_id");
_di_IXMLNode xmessage_id = xHeader->ChildNodes->FindNode(WideString("message_id"));
xmessage_id->Text = WideString("9");
<?xml version="1.0" encoding="utf-8"?>
<Message>
<Header>
<message_id>9</message_id>
</Header>
<Header>
<message_id>9</message_id>
</Header>
</Message>