title: Add Comma between Multiple return Values
body: <p>I got an XML which looks like:</p>
  
  <pre><code>&lt;Student&gt;
      &lt;SSN&gt;630-44-3532&lt;/SSN&gt;
      &lt;Name&gt;
          &lt;firstName&gt;Ali&lt;/firstName&gt;
          &lt;lastName&gt;Daria&lt;/lastName&gt;
      &lt;/Name&gt;
              ...
      &lt;Email&gt;Ali@yahoo.com&lt;/Email&gt;
      &lt;Email&gt;Ali@hotmail.com&lt;/Email&gt;
  &lt;/Student&gt;
  </code></pre>
  
  <p>As we have multiple  nodes, when I execute an XQuery to get the email info as a whole, separated by a comma, I don't know what to do.</p>
  
  <p>Here is the expected output:</p>
  
  <pre><code>&lt;email&gt; Alexander@yahoo.com, Alexander@gmail.com &lt;/email&gt;
  </code></pre>