docs: function (str) {
              var xmlDoc;
              var DOMParser = Aria.$global.DOMParser;
              if (DOMParser) {
                  var parser = new DOMParser();
                  xmlDoc = parser.parseFromString(str, "text/xml");
              } else { // Internet Explorer
                  var ActiveXObject = Aria.$global.ActiveXObject;
                  xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                  xmlDoc.async = "false";
                  xmlDoc.loadXML(str);
              }
  
              if (xmlDoc.hasChildNodes()) {
                  return this.__parseXmlNode(xmlDoc);
              } else {
                  return null;
              }
          }