XML과 XMLList의 차이

var xml:XML = 
<xml>
	<ui idx = "0">
		<item idx ="0"><key/></item>
		<item idx ="1"><key/></item>
		<item idx ="2"><key/></item>
	</ui>
	<ui idx = "1">
		<item idx ="0"></item>
	</ui>
</xml>;
var xml1:XML =<example><two>2</two></example>;


trace(xml is XML);				//true
trace(xml is XMLList);			//false
trace(xml.ui is XML); 			//false
trace(xml.ui is XMLList); 		//true
trace(xml1.two is XML); 		//false
trace(xml1.two is XMLList); 	//true
trace(xml.ui as XML);			//null
trace(xml.ui as XMLList);		//값 출력

차이
XML은 최상위 노드가 한개이면 XML
XMLList는 최상위 노드가 여러개 - XML을 여러개 담은 배열
그래서 <xml>은 XML, <ui>는 2개가 있으니까 XMLList 

 <xml name="XML">
  <ui>
    <item name="adasd0" ssize="32"/>
    <item name="adasd1" ssize="22"/>
    <item name="adasd2" ssize="111"/>
    <item name="adasd3" ssize="44"/>
  </ui>
  <translation name="translation"/>
  <sound name="sound" play="sndPlay" stop="sndStop" pause="sndPause"/>
  <link name="a" index="b"/>
</xml>
ar uLoader:URLLoader = $e.target as URLLoader;
uLoader.removeEventListener(Event.COMPLETE, onComplete);
var xml:XML = XML(uLoader.data);
if (xml) 
{
	
	trace(xml);						//데이터
	trace(typeof uLoader.data);			//string
	trace(xml is XML);				//true
	trace(xml is XMLList);				//false
	trace(xml.ui is XML);				//false
	trace(xml.ui is XMLList);			//true
	var xml2:XML = XML(xml.ui);		//success
	trace(xml.ui.item is XML);			//false
	trace(xml.ui.item is XMLList);		//true
	//var xml3:XML = XML(xml.ui.item);	//failed
 }