How to append a value in the header of xml using oracle?

@hal.littel 

To append a value in the header of an XML document using Oracle, you can use the XMLQuery function along with XMLELEMENT and XMLForest functions. Here is an example:

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DECLARE
  xml_data XMLType;
  header_value VARCHAR2(100) := 'Appended Header Value';
BEGIN
  SELECT XMLQuery('copy $d modify ( insert node 
          <header>
            <value>' || header_value || '</value>
          </header>
          after $d//root
        ) 
        return $d' passing xml_data
      returning content)
  INTO xml_data
  FROM your_xml_table
  WHERE your_condition;

  UPDATE your_xml_table
  SET xml_content = xml_data
  WHERE your_condition;
END;
/

In this example, you would need to replace your_xml_table with the name of the table where your XML data is stored, and your_condition with the appropriate condition to select the specific XML data that you want to update.

This script inserts a new <header> element with the specified <value> under the root element of the XML document. You can modify the script to suit your specific requirements as needed.