private function createParser():void {
    
    var parser:NodeParser = new NodeParser(Soma.getInstance().library);
    
    var xml:XML = <myAssets>
        <video id="myVideo" url="video/video.flv" x="50" alpha=".5" verticalCenter="0" volume="0" />
        <image id="myImage" file="image.png" scaleX=".5" scaleY=".5" blendMode="multiply" ratio="ratio_in"/>
        <bitmap id="myBitmap" linkage="AssetClassNameBitmap" x="170" y="170" blendMode="multiply" scaleX=".3" scaleY=".3"/>
        <movieclip id="myMovieClip" linkage="AssetClassNameMovieClip" x="170" y="280" scaleX=".3" scaleY=".3"/>
        <text id="myText" style="body" x="10" y="10" width="200"><![CDATA[Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer sed massa turpis, sit amet ornare nisl.]]></text>
        <xml id="myXML" file="sample.xml"/>
    </myAssets>;
    
    parser.add(xml.children());
    
    // you can also use a single XML node to add an asset to the parser instance:
    //parser.add(new XML ('<xml id="myXML" file="data/sample.xml"/>'));
    
    // this implies that you have created a CircleSimple class (class instantiated)
    // an IAsset class CircleAsset (class that instantiates CircleSimple)
    // and that you have added it to the Library used by the parser, example:
    // Soma.getInstance().config.registerClass(CircleSimple);
    // Soma.getInstance().library.registerAsset("circleParam", CircleAsset);
    // See the Soma Protest code source to find an example.
    //parser.add(new XML ('<circle id="myCustomAsset" classname="CircleSimple" width="100" height="100" alpha=".5" right="10" bottom="10"/>')); 
    
    parser.addEventListener(ParserEvent.WILL_PARSE, events);
    parser.addEventListener(ParserEvent.WILL_LOAD, events);
    parser.addEventListener(ParserEvent.WILL_SET_PROPERTIES, events);
    parser.addEventListener(ParserEvent.WILL_SET_BASEUI_PROPERTIES, events);
    parser.addEventListener(ParserEvent.ASSET_LOADED, events);
    parser.addEventListener(ParserEvent.COMPLETE, events);
    var myAssets:Array = parser.run(this, Soma.getInstance().baseUI, Soma.getInstance().loader);
    trace(myAssets);
}

private function events(e:ParserEvent):void {
    trace("Event received: ", e);
    if (e.type == ParserEvent.COMPLETE) e.parser.dispose();
}