title: Blueprint read value from configuration file
body: <p>I have a Blueprint.xml, and i need read values from an external configuration file (in this example the value to put in _from1):</p>
  
  <pre><code>....
  
   &lt;camelContext id="cbr-example-context" xmlns="http://camel.apache.org/schema/blueprint"&gt;
  
          &lt;route id="cbr-route"&gt;
  
               &lt;from id="_from1" uri="ftp://user@localhost:21/files?password=pass"/&gt;   
  
  
              &lt;to id="_to1" uri="file:c:/TestFTP"/&gt;
  
          &lt;/route&gt;
      &lt;/camelContext&gt;
  &lt;/blueprint&gt;
  </code></pre>