title: Extract a value from a property in camel-context.xml
body: <p>The input looks like below,</p>
  
  <pre><code>&lt;book author="ABC" type="Children"&gt;
      &lt;id&gt;123&lt;/id&gt;
      &lt;name&gt;XYZ&lt;/name&gt;
  &lt;/book&gt;
  </code></pre>
  
  <p>I have set the above in property in an xml route as:</p>
  
  <pre><code>&lt;camel:setProperty propertyName="REQUEST"&gt;
      &lt;camel:xpath&gt;/node()&lt;/camel:xpath&gt;
  &lt;/camel:setProperty&gt;
  </code></pre>
  
  <p>Then I do some other processing and based on the new response I want to extract the value of an author(i.e. ABC) from this Property and compare it with a element's text string from the response.</p>
  
  <p>I tried a few ways using camel:xpath and camel:simple but am not able to extract the value from property.</p>
  
  <p>What is the correct way to extract this property?</p>