title: RDF correct approach to subClassOf
body: <p>What's the difference between these two approaches?</p>
  
  <p>a)</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;rdf:RDF
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:tur="http://www.blah.com/turismo#"&gt;
  
  &lt;rdf:Description rdf:about="http://www.blah.com/turismo#plaza"&gt;
      &lt;rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/&gt;
  &lt;/rdf:Description&gt;
  
  &lt;rdf:Description rdf:about="http://www.blah.com/turismo#plazaSinFuente"&gt;
      &lt;rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/&gt;
      &lt;rdfs:subClassOf rdf:resource="http://www.blah.com/turismo#plaza"/&gt;
  &lt;/rdf:Description&gt;
  </code></pre>
  
  <p>b)</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;rdf:RDF
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
     xmlns:tur="http://www.blah.com/turismo#"&gt;
  
      &lt;rdfs:Class rdf:ID="plaza"/&gt;
  
  &lt;rdfs:Class rdf:ID="plazaSinFuente"&gt;
          &lt;rdfs:subClassOf rdf:resource="#plaza"/&gt;
      &lt;/rdfs:Class&gt;
  </code></pre>