Source
<rdf:RDF
xmlns="http://purl.org/rss/1.0/"
xmlns:image="http://purl.org/rss/1.0/modules/image/"
>
...
<image rdf:about="http://example.com/rss_logo.png">
<title>Title</title>
<link>http://example.com/</link>
<url>http://example.com/rss_logo.png</url>
</image>
Reference
NDO::Weblog - 2003-07-12http://naoya.dyndns.org/~naoya/mt/archives/000296.html
The Web KANZAKI - RSS(RDF Site Summary)によるサイト情報の要約と公開
http://www.kanzaki.com/docs/sw/rss.html
via
Landscape - 2004-12-08http://sonic64.com/2004-12-08.html#2004-12-08-1