[Aleksey123]

Спасибо.

Так работает:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"  
initialize="Func()">

<mx:Script>
<![CDATA[
	public function Func():void{
		var myXML:XML = 
			<order>
			 <item id='1'>
			  <menuName>burger</menuName>
  			  <price>3.95</price>
			 </item>
			 <item id='2'>
			  <menuName>fries</menuName>
			  <price>1.45</price>
			 </item>
			</order>

		trace(myXML.item[0].menuName); 
		trace(myXML.item.(@id==2).menuName); 
		trace(myXML.item.(menuName=="burger").price);
	}
]]>
</mx:Script>
</mx:Application>