title: How do I express the following sentence in valid owl syntax?
body: <p>All math courses are taught by David only (no other lecturer must be involved).`</p>
  
  <pre><code>&lt;owl:Class rdf:ID="Math"&gt;
  &lt;owl:Restriction&gt;
  &lt;owl:onProperty uni:Resource="#isTaughtBy"/&gt;
  &lt;owl:allValuesFrom uni:Resource="#9432"/&gt;
  &lt;/owl:Restriction&gt;
  &lt;/owl:Class&gt;
  </code></pre>
  
  <p>the above code seems invalid why i try to draw the graph please help.
  If anyone is wondering about the #9432 it refers to David</p>