将xml数据转换成ArrayCollection

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" creationComplete="application1_creationCompleteHandler()"
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
    <s:layout>
        <s:VerticalLayout verticalAlign="middle" horizontalAlign="center"/>
    </s:layout>
    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.events.FlexEvent;
            import mx.rpc.events.ResultEvent;
            [Bindable]
            private var d:XML;
            [Bindable]
            private var dgdp:ArrayCollection=new ArrayCollection();
            
            protected function httpservice1_resultHandler(event:ResultEvent):void
            {
                d=event.result as XML;
                trace(d);
                for each (var xml:XML in d..des){
                    var o:Object=new Object();
                    o.score=xml.@score;
                    o.classes=xml.@classes;
                    o.value=xml.@value;
                    dgdp.addItem(o);
                }
            }
            protected function application1_creationCompleteHandler():void
            {
                http.send();
                
            }
        ]]>
    </fx:Script>
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <s:HTTPService id="http" url="data/data.xml" resultFormat="e4x" result="httpservice1_resultHandler(event)" />
    </fx:Declarations>
    <s:DataGrid id="dg" width="400" height="200" requestedRowCount="4" dataProvider="{dgdp}">
        <s:columns>
            <s:ArrayList>
                <s:GridColumn dataField="score" headerText="score"></s:GridColumn>
                <s:GridColumn dataField="classes" headerText="classes"></s:GridColumn>
                <s:GridColumn dataField="value" headerText="value"></s:GridColumn>
            </s:ArrayList>
        </s:columns>
    </s:DataGrid>
</s:Application>