title: Iterate and concat using XPath Expression
body: <p>I have the following xml file:</p>
  
  <pre><code>&lt;author&gt;
    &lt;firstname&gt;Akhilesh&lt;/firstname&gt;
    &lt;lastname&gt;Singh&lt;/lastname&gt;
  &lt;/author&gt;
  &lt;author&gt;
    &lt;firstname&gt;Prassana&lt;/firstname&gt;
    &lt;lastname&gt;Nagaraj&lt;/lastname&gt;
  &lt;/author&gt;
  </code></pre>
  
  <p>And I am using the following <code>JXPath</code> expression,</p>
  
  <pre><code>concat(author/firstName," ",author/lastName)
  </code></pre>
  
  <p>To get the value <code>Akhilesh Singh ,Prassana Nagaraj</code> but 
  I am getting only <code>Akhilesh Singh</code>. </p>
  
  <p>My requirement is that I should get the value of both author by executing only one <code>JXPath</code> expression.</p>