From FOAF

It would be nice for the FOAF vocabulary to include an inverse property of foaf:thumbnail.

current status: open

This is a FoafVocab issue, documented as such by linking it from the IssueTracker page.

* Mail from Morten Frederiksen to rdfweb-dev

[edit] Example

An RSS channel referencing a web-sized image that has a thumbnail as well as an original version and a page showing the image, with a link to the original.

...
<rss:channel rdf:about="http://example.com/gallery/index.rdf">
  ...
  <rss:items>
    <rdf:Seq>
      <rdf:li rdf:resource="http://example.com/gallery/image.jpg"/>
    </rdf:Seq>
  </rss:items>
</rss:channel>
<rss:item rdf:about="http://example.com/gallery/image.jpg">
  <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Image"/>
  <rss:title>Example image</rss:title>
  <rss:link>http://example.com/gallery/image.html</rss:link>
  <foaf:page rdf:resource="http://example.com/gallery/image.html"/>
  <foaf:thumbnail rdf:resource="http://example.com/gallery/image.thumb.jpg"/>
  <foaf:original rdf:resource="http://example.com/gallery/image.original.jpg"/>
</rss:item>
...