title: how to save payload of soa composite to xml file?
body: <p>i am working on oracle <strong>SOA project</strong> in which i want to save csv data to XML file. till now i got the payload in form of xml using <strong>Translate activity</strong> but i can only use it directly. I want to save the pay load to xml file.</p>
  
  <p>i am facing following error :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;bpelFault&gt;
     &lt;faultType&gt;0&lt;/faultType&gt;
     &lt;subLanguageExecutionFault xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable"&gt;
        &lt;part name="summary"&gt;
           &lt;summary&gt;An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc("../Transformations/Transformation.xsl", $Receive_Read_InputVariable.body)&lt;/summary&gt;
        &lt;/part&gt;
        &lt;part name="code"&gt;
           &lt;code&gt;XPath expression failed to execute&lt;/code&gt;
        &lt;/part&gt;
        &lt;part name="detail"&gt;
           &lt;detail&gt;XPath expression failed to execute.
  An error occurs while processing the XPath expression; the expression is ora:doXSLTransformForDoc("../Transformations/Transformation.xsl", $Receive_Read_InputVariable.body)
  The XPath expression failed to execute; the reason was: javax.xml.transform.TransformerException: oramds:/deployed-composites/default/CSV_To_XML_rev1.0/Transformations/Transformation.xsl&amp;lt;Line 30, Column 109&amp;gt;: XML-22031: (Error) Variable not defined: 'oracle_empty_param'.
  Check the detailed root cause described in the exception message text and verify that the XPath query is correct.
  &lt;/detail&gt;
        &lt;/part&gt;
     &lt;/subLanguageExecutionFault&gt;
  &lt;/bpelFault&gt;
  </code></pre>
  
  <p>I am working with <strong>oracle soa suite 12c.</strong></p>