GeoRSS :: Geographically Encoded Objects for RSS feeds

 <entry>
 ...
   <where
     xml:id="location"
     type="application/atom+xml;type=entry"
     href="http://pleiades.stoa.org/places/639166.atom#location"
     />
 </entry>

<georss:polygon rel="geometry" src="http://geonames.org/geometries/5867680" 
  excerpt="..." 
  featurename="Cedarburg, Wisconsin" 
  type="application/vnd.google-earth.kml+xml"/>