code: function (xmlDom) {
              // Create a WmtsCapabilities object from the XML DOM
              var wmtsCapabilities = new WorldWind.WmtsCapabilities(xmlDom);
              // Retrieve a WmtsLayerCapabilities object by the desired layer name
              var wmtsLayerCapabilities = wmtsCapabilities.getLayer(layerIdentifier);
              // Form a configuration object from the WmtsLayerCapabilities object
              var wmtsConfig = WorldWind.WmtsLayer.formLayerConfiguration(wmtsLayerCapabilities);
              // Create the WMTS Layer from the configuration object
              var wmtsLayer = new WorldWind.WmtsLayer(wmtsConfig);
  
              // Add the layers to WorldWind and update the layer manager
              wwd.addLayer(wmtsLayer);
              layerManager.synchronizeLayerList();
          }
docs: Called asynchronously to parse and create the WMTS layer