docs: function textXml(data) {
                  var xml = undefined,
                      tmp = undefined;
                  if (!data || typeof data !== "string") {
                      return null;
                  }
  
                  // Support: IE9
                  try {
                      tmp = new DOMParser();
                      xml = tmp.parseFromString(data, "text/xml");
                  } catch (e) {
                      xml = undefined;
                  }
  
                  if (!xml || xml.getElementsByTagName("parsererror").length) {
                      throwError("Invalid XML: " + data);
                  }
                  return xml;
              }