GeoRSS:
GPX:
KML:
KMZ:

Layer Options:
GeoXmlLayer - Local Data Sample This sample shows how to load geospatial XML data from locally hosted files.
Note: Not all file and mime types are enabled in all servers. If using .NET, it is recommended to add the following to the web.config file:

<system.webServer>
  <staticContent>
    <mimeMap fileExtension=".json" mimeType="application/json" />
    <mimeMap fileExtension=".geojson" mimeType="application/json" />
    <mimeMap fileExtension=".gpx" mimeType="application/xml" />
    <mimeMap fileExtension=".georss" mimeType="application/xml" />
    <mimeMap fileExtension=".kml" mimeType="application/vnd.google-earth.kml+xml" />
    <mimeMap fileExtension=".kmz" mimeType="application/vnd.google-earth.kmz" />
  </staticContent>
<system.webServer>