code: function(sValue) {
  			if(!XML || !YAHOO.lang.isFunction(XML.ObjTree) ) {
  				alert("ObjTree.js not loaded.");
  				return null;
  			}
  			var xotree = new XML.ObjTree();
  		  	var tree = xotree.parseXML( sValue );
  			return tree;
  		}
docs: deserialize from XML
  @static