Populating XML by binding external data

           
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    backgroundColor="white">
    <mx:Script>[Bindable] public var userid:int=0;</mx:Script>
    <mx:XML id="usersXML">
        <root>
            <users>
                <user userid="{userid}">{myTextInput.text}</user>
            </users>
        </root>
    </mx:XML>
    <mx:Label text="Name:" />
    <mx:TextInput id="myTextInput"
        change="myTextArea.text=usersXML.toXMLString()" />
    <mx:TextArea id="myTextArea" width="250" height="100" />
</mx:Application>

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Populating XML by binding external data : XML data « Data Model « Flex

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