Symbolic Concept Schemes

To describe the preferred and alternative symbolic labels for a concept, do for example:

<rdf:RDF  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:skos="http://www.w3.org/2004/02/skos/core#">

   <skos:Concept rdf:about="http://example.org/scheme/concept#banana">
      <skos:prefSymbol rdf:resource="http://example.org/scheme/symbol/banana1.jpg"/>
      <skos:altSymbol rdf:resource="http://example.org/scheme/symbol/banana2.jpg"/>
      <skos:altSymbol rdf:resource="http://example.org/scheme/symbol/banana3.jpg"/>
   </skos:Concept>   

</rdf:RDF>

Note that skos:prefSymbol and skos:altSymbol allow you to state the preferred and alternative symbolic labels for a concept, which is different from a depiction of a concept. E.g. the set of UK road traffic signs could be modelled as a set of symbolic labels for road safety concepts; some of the signs depict the concept they represent (e.g. 'slippery road') and some don't (e.g. 'no entry').