No XML header, so overly smart browsers still render this as text.

<rss version="2.0" xmlns:rss-foaf="http://rss-extensions.org/wiki/Rss-foaf">
   <channel>
      <title>John Doe's Friends</title>
      <link>http://john.doe.example.com</link>
      <description>List of John Doe's Friends.</description>
      <pubDate>Fri, 23 Sep 2005 23:33:34 GMT</pubDate>
      <lastBuildDate>Fri, 23 Sep 2005 23:33:33 GMT</lastBuildDate>

      <item>
         <title>Person: Richard Roe (Stranger)</title>
         <link>http://example.com/~roe</link>
         <description>He's a stranger.</description>
         <rss-foaf:type name="Person"/>
         <rss-foaf:rel to="http://netmesh.info/jernst-files/rss-foaf-example.xml#Group_Unknown"/>
      </item>

      <item>
         <title>Person: Jane Doe (Family)</title>
         <link>http://jane.doe.example.com</link>
         <description>My honey.</description>
         <rss-foaf:type name="Person"/>
         <rss-foaf:rel to="http://netmesh.info/jernst-files/rss-foaf-example.xml#Group_Family"/>
      </item>

      <item>
         <title>Pet: Hasso (Family)</title>
         <link>http://hasso.doe.example.com</link>
         <description>Best buddy.</description>
         <rss-foaf:type name="Pet"/>
         <rss-foaf:rel to="http://netmesh.info/jernst-files/rss-foaf-example.xml#Group_Family"/>
      </item>

      <item>
         <title>Group: Family</title>
         <description>My family.</description>
         <guid>http://netmesh.info/jernst-files/rss-foaf-example.xml#Group_Family</guid>
         <rss-foaf:group name="Family"/>
      </item>

      <item>
         <title>Group: Strangers</title>
         <description>People I might have interacted at some point but don't remember.</description>
         <guid>http://netmesh.info/jernst-files/rss-foaf-example.xml#Group_Unknown</guid>
         <rss-foaf:group name="Strangers"/>
      </item>
   </channel>
</rss>