import mx.rpc.xml.SimpleXMLEncoder;
private var o:Object = {name:"A",description_items:{height:'183cm', weight:'77k'}};
private var doc:XMLDocument;
private function init():void {
doc = new XMLDocument('');
var simpleEncode:SimpleXMLEncoder = new SimpleXMLEncoder(doc);
var node:XMLNode = simpleEncode.encodeValue(o, new QName('http://localhost/ws', 'ls'), doc.firstChild);
}