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Reference XML attribute for tree data

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:XML id="capitals">         <root>             <Capitals label="A">                 <capital label="A1" value="value 1" />                 <capital label="A2" value="value 2" />                 <capital label="A3" value="value 3" />             </Capitals>             <Capitals label="B">                 <capital label="B1" value="value 4" />                 <capital label="B2" value="value 5" />                 <capital label="B3" value="value 6" />             </Capitals>         </root>     </mx:XML>     <mx:Tree id="Tree1" dataProvider="{capitals}" labelField="@label" showRoot="false" width="300" /> </mx:Application>