You need to use the `GeoEvent Extension for ArcGis Server` in order to use realtime data. You can find tutorials on how to use it over here:
http://server.arcgis.com/en/geoevent-extension/latest/get-started/what-is-arcgis-geoevent-extension-for-server.htm

I took a look at the xml-stream, but there is no geodata available. So you might want to use a geolocator too.