title: Xpath extractor
body: <p>Can someone help me with this:
  I am using xpath extractor of jmeter to retrieve sessionId value from the below response.</p>
  
  <p>I need the value of the sessionId to be stored in some file, so that i can use that value in succeeding calls..My basic response is as below:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;
  &lt;ns2:createUserResponse xmlns:ns2="http://www.musicthp.com" 
                          isNewUser="false"
                          profileId="32109" 
                          sessionId="ryIlb+E5yj7FReA2w96uag=="
                          success="true"&gt;
   &lt;duration&gt;316&lt;/duration&gt;
  &lt;/ns2:createUserResponse&gt;`
  </code></pre>