title: Select a list of unique element from a node list using XPATH
body: <p>Is it possible in XPATH to select a list of unique element from a node where there are many of the same?</p>
  
  <pre><code>&lt;Deserts&gt;
   &lt;Desert Code="C1"&gt;Popsicle&lt;Desert&gt;
   &lt;Desert Code="H2"&gt;Ice Cream&lt;Desert&gt;
   &lt;Desert Code="C1"&gt;Popsicle&lt;Desert&gt;
   &lt;Desert Code="T1"&gt;Cheese Cake&lt;Desert&gt;
  &lt;/Deserts&gt;
  </code></pre>
  
  <p>In this example I want the resulting list to have only 3 nodes (Popsicle / Ice Cream / Cheese Cake).</p>
  
  <p>How can I select such a list with Xpath? </p>