<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
public var usersXML:XML=<users>
<user id="1">A</user>
<user id="2">B</user>
</users>;
public function togglePretty():void{
XML.prettyPrinting = !XML.prettyPrinting;
myTextArea.text = usersXML.toString();
}
</mx:Script>
<mx:TextArea id="myTextArea" width="200" height="100" />
<mx:Button label="Toggle Pretty Printing" click="togglePretty()" />
</mx:Application>
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