AS3 Deep XML Parsing

How to efficiently parse the following XML file in short ActionScript3 into a class such as:

class bbbbbbbb {
         var level2_1:String;
         var level2_2:Array;
         var level2_3:Array;
         var level3_1:Array;
}

This is the XML file:

<root>
    <level1>
        <level2_1>Content开发者_高级运维</level2_1>

        <level2_2>
            <level3>Content1</level3>
            <level3>Content2</level3>
            <level3>Content3</level3>
            <level3>Content4</level3>
            <level3>Content5</level3>

            <level3_1>
                <level4>Content1</level4>
                <level4>Content2</level4>
                <level4>Content3</level4>
                <level4>Content4</level4>
            </level3_1>

        </level2_2>

        <level2_3>Content</level2_3>

    </level1>



    <level1>
        <level2_1>Content</level2_1>

        <level2_2>
            <level3>Content1</level3>
            <level3>Content2</level3>
            <level3>Content3</level3>
            <level3>Content4</level3>
            <level3>Content5</level3>

            <level3_1>
                <level4>Content1</level4>
                <level4>Content2</level4>
                <level4>Content3</level4>
                <level4>Content4</level4>
            </level3_1>

        </level2_2>

        <level2_3>Content</level2_3>

    </level1>



    <level1>
        <level2_1>Content</level2_1>

        <level2_2>
            <level3>Content1</level3>
            <level3>Content2</level3>
            <level3>Content3</level3>
            <level3>Content4</level3>
            <level3>Content5</level3>

            <level3_1>
                <level4>Content1</level4>
                <level4>Content2</level4>
                <level4>Content3</level4>
                <level4>Content4</level4>
            </level3_1>

        </level2_2>

        <level2_3>Content</level2_3>

    </level1>


</root>