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Reference attribute value in XML model

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">   <mx:Script>          [Bindable]     public var xdata:XML = <order>         <item id = "1">           <description>A</description>         </item>         <item id = "2">           <description>B</description>         </item>       </order>;   </mx:Script>   <mx:Label text="Using || (or) notation." />   <mx:List width="25%" dataProvider="{xdata.item.(@id=='1'||@id=='2').description}" /> </mx:Application>