Oracle XML functions return tags for null columns.

I am currently writing a SOAP Message base on a SQL statement formatted as XML. However, I am having problems with Oracle XML functions not returning tags for null columns as seen in my example below. Is the a way to get Oracle XML functions to return empty tags for null column?
CREATE TABLE FOREXAMPLE_TABLE (COLUMN_1 VARCHAR2 (4000),
COLUMN_2 VARCHAR2 (4000),
COLUMN_3 VARCHAR2 (4000));
INSERT INTO FOREXAMPLE_TABLE (COLUMN_2)
VALUES ('This column is not null');
COMMIT;
SELECT XMLELEMENT ( "soap:Envelope",
XMLATTRIBUTES ( 'http://schemas.xmlsoap.org/soap/envelope/' AS "xmlns:soap"),
XMLELEMENT ( "soap:Body",
XMLATTRIBUTES ( 'http://Custom_Column/types/' AS "xmlns:ns1"),
XMLELEMENT ( "ns1:New_Instance",
XMLELEMENT ( "ns1:Input_XMLDoc",
XMLFOREST(fe.COLUMN_1 as "Column_1",
fe.COLUMN_2 as "Column_2",
fe.COLUMN_3 as "Column_3"))))) as xml
FROM FOREXAMPLE_TABLE fe
The results returned from the select statement.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body xmlns:ns1="http://Custom_Column/types/"><ns1:New_Instance>
<ns1:Input_XMLDoc><Column_2>This column is not null</Column_2>
</ns1:Input_XMLDoc></ns1:New_Instance></soap:Body></soap:Envelope>
The desired results for the select statement.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body xmlns:ns1="http://Custom_Column/types/"><ns1:New_Instance>
<ns1:Input_XMLDoc><Column_1></Column_1>
<Column_2>This column is not null</Column_2><Column_3></Column_3>
</ns1:Input_XMLDoc></ns1:New_Instance></soap:Body></soap:Envelope>
jeeman

An alternative may be be to use xmlconcat instead of xmlforest:
Time Start: 30.06.2007 18:52:41
PL/SQL procedure successfully completed.
michaels>  select xmlelement
          ("soap:Envelope",
           xmlattributes
                  ('http://schemas.xmlsoap.org/soap/envelope/' as "xmlns:soap"),
           xmlelement
                ("soap:Body",
                 xmlattributes ('http://Custom_Column/types/' as "xmlns:ns1"),
                 xmlelement ("ns1:New_Instance",
                             xmlelement ("ns1:Input_XMLDoc",
                                         xmlconcat (xmlelement("Column_1", fe.column_1),
                                                    xmlelement("Column_2", fe.column_2),
                                                    xmlelement("Column_3", fe.column_3)
          ).extract('.').getstringval() as xml
  from (select null column_1, 'This column is not null' column_2,
               null column_3
          from dual) fe
XML                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
  <soap:Body xmlns:ns1="http://Custom_Column/types/">                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
    <ns1:New_Instance>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
      <ns1:Input_XMLDoc>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
        <Column_1/>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
        <Column_2>This column is not null</Column_2>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
        <Column_3/>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
      </ns1:Input_XMLDoc>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
    </ns1:New_Instance>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
  </soap:Body>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
</soap:Envelope>                                                                                             

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