title: not able to get node value in the xpath by getNodeValue function in groovy
body: <p>I am not not able to get node value for "idNumber" in the below response xml </p>
  
  <pre><code>&lt;soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"&gt;
     &lt;soapenv:Body&gt;
        &lt;SOAP_Customer_Metadata_CALLResponse xmlns="http://BCE/Customer_Metadata_WS.tws"&gt;
           &lt;oMetaDataID&gt;
              &lt;ocrStatus&gt;Failed&lt;/ocrStatus&gt;
              &lt;guid&gt;123456&lt;/guid&gt;
              &lt;docType&gt;03&lt;/docType&gt;
              &lt;docDescription&gt;South African ID&lt;/docDescription&gt;
              &lt;surname&gt;Choudhary&lt;/surname&gt;
              &lt;fullName&gt;Kanika&lt;/fullName&gt;
              &lt;idNumber&gt;KANJANDHS293&lt;/idNumber&gt;
              &lt;dateOfBirth&gt;22091945&lt;/dateOfBirth&gt;
              &lt;dateIssued&gt;01012016&lt;/dateIssued&gt;
              &lt;countryOfBirth&gt;India&lt;/countryOfBirth&gt;
              &lt;idType&gt;ID&lt;/idType&gt;
              &lt;gender&gt;F&lt;/gender&gt;
           &lt;/oMetaDataID&gt;
           &lt;oMetaDataPOA&gt;
              &lt;ocrStatus&gt;Passed&lt;/ocrStatus&gt;
              &lt;surname&gt;Choudhary&lt;/surname&gt;
              &lt;idNo&gt;12345&lt;/idNo&gt;
              &lt;address1&gt;abc def&lt;/address1&gt;
           &lt;/oMetaDataPOA&gt;
           &lt;oResubmission&gt;No&lt;/oResubmission&gt;
           &lt;oCASASequenceNo&gt;1234578&lt;/oCASASequenceNo&gt;
           &lt;oTypeOfCustomer&gt;New&lt;/oTypeOfCustomer&gt;
        &lt;/SOAP_Customer_Metadata_CALLResponse&gt;
     &lt;/soapenv:Body&gt;
  &lt;/soapenv:Envelope&gt;
  </code></pre>
  
  <p>Using the follow code in a <em>Groovy script</em> testStep:</p>
  
  <pre><code>holder.getNodeValue("//idNumber")
  </code></pre>