Oracle XMLDOM - How do I update a node text value using dbms_xmldom.setNodeValue()?

Hello Experts,

When a node text value is null, how do I update a node text value using dbms_xmldom.setNodeValue() method?  The code below runs in 10g.  The <NAME> node updates.  But, the <NAME2> node does not.  Do i need to add a text node to <NAME2> first?  How?  Is there another way?

declare

  var       XMLType;
  buf       clob;
 
  l_xmldoc  dbms_xmldom.DOMDocument;
  l_root    dbms_xmldom.DOMNode;
  l_node    dbms_xmldom.DOMNode;

begin
   var := xmltype('<PERSON> <NAME>ChangeMe</NAME> <NAME2></NAME2> </PERSON>');

   -- Create DOMDocument handle:
   l_xmldoc     := dbms_xmldom.newDOMDocument(var);
   l_root    := dbms_xmldom.makeNode(l_xmldoc);

   -- before
   dbms_xmldom.writetobuffer(l_root, buf);
   dbms_output.put_line('Before:');
   dbms_output.put_line(buf);
   
   -- replace name.text
   l_node := dbms_xslprocessor.selectSingleNode(l_root,'//NAME/text()');
   if dbms_xmldom.isnull(l_node) then
      dbms_output.put_line('IsNull:');
      dbms_xmldom.setNodeValue(l_node, 'node is null');  
   else
      -- Manipulate:
      dbms_xmldom.setNodeValue(l_node, 'raj');
   end if;
   
   -- replace name2.text... how is this done when the text node is null?  
   l_node := dbms_xslprocessor.selectSingleNode(l_root,'//NAME2/text()');
   if dbms_xmldom.isnull(l_node) then
      dbms_output.put_line('IsNull: And, setNodeValue() does nothing to <NAME2>');
      dbms_xmldom.setNodeValue(l_node, 'node is null');  
   else
      -- Manipulate:
      dbms_xmldom.setNodeValue(l_node, 'node is not null');
   end if;

   -- after
   dbms_xmldom.writetobuffer(l_root, buf);
   dbms_output.put_line('After:');
   dbms_output.put_line(buf);
   
end;


the code above yields the following output:

Before:
<PERSON>
  <NAME>ChangeMe</NAME>
  <NAME2/>
</PERSON>

IsNull: And, setNodeValue() does nothing to <NAME2>
After:
<PERSON>
  <NAME>raj</NAME>
  <NAME2/>
</PERSON>