Adding version and stylesheet href to an XML content

Question

Hi there guys!
I am new working with XML in Oracle 9i, so I would appreciate your tips. My problem is that I need to store a XML document into a variable, which must include the "version" and "stylesheet href" lines on its body.
For example, if I use the following sample query:
    SELECT XMLCONCAT(
        XMLELEMENT("TraspasoSaldo",
            SELECT
                XMLELEMENT("Encabezado",
                    XMLELEMENT("Valor1", 'Valor1'),
                    XMLELEMENT("Valor2", 'Valor2')
                ) As "Encabezado"
            FROM Dual
            SELECT
                XMLELEMENT("Detalle",
                    XMLELEMENT("Valor1", 'Valor1'),
                    XMLELEMENT("Valor2", 'Valor2')
                ) As "Detalle"
            FROM Dual
    ).getclobval()
    INTO
        XMLCONTENTDATA    --> Declared as: XMLCONTENTDATA CLOB := EMPTY_CLOB;
    FROM Dual
    ;Above query saves the following XML content in the XMLCONTENTDATA variable, which is correct:
  <TraspasoSaldo>
    <Encabezado>
      <Valor1>Valor1</Valor1>
      <Valor2>Valor2</Valor2>
    </Encabezado>
    <Detalle>
      <Valor1>Valor1</Valor1>
      <Valor2>Valor2</Valor2>
    </Detalle>
  </TraspasoSaldo>But, I need to add next 2 lines to this XML document:
  <?xml version = ''1.0''?>
  <?xml-stylesheet href="../xsl_path/My_StyleSheet.xsl" type="text/xsl"?>I have tried many things without success, because the XML content always looses its properties and structure. For example, trying to avoid this problem, I have tried to concatenate these 2 lines using the following trick:
    x := '<?xml version = ''1.0''?>' || CHR(13) || CHR(10);
    len := length(x);
    dbms_lob.writeappend(HEADCLOB, len, x);
    x := '<?xml-stylesheet href="../xsl_path/My_StyleSheet.xsl" type="text/xsl"?>' || CHR(13) || CHR(10);
    len := length(x);
    dbms_lob.writeappend(HEADCLOB, len, x);
    dbms_lob.append(HEADCLOB, XMLCONTENTDATA);
    XMLCONTENTDATA := HEADCLOB;But at the end I just received a text file, instead of a XML document:
<?xmlversion=''1.0''?>
<?xml-stylesheethref="../xsl_path/My_StyleSheet.xsl"type="text/xsl"?>
<TraspasoSaldo><Encabezado><Valor1>Valor1</Valor1><Valor2>Valor2</Valor2></Encabezado><Detalle><Valor1>Valor1</Valor1><Valor2>Valor2</Valor2></Detalle></TraspasoSaldo>As you can see above, the XML structure is lost, so the content of the XMLCONTENTDATA variable is not an XML anymore.
Any tips or ideas?
Thanks very much in advance for any help on this issue!!
PS: It is required to save this XML content into a variable in order to pass its value to a program.
Best regards,
Francisco

Answer 1

As you can see above, the XML structure is lost, so the content of the XMLCONTENTDATA variable is not an XML anymore.The structure (i.e. format) is absolutely of no importance for a xml file.
What you have shown when concatenating the two parts still make a valid xml !!
Nevertheless you can also always do sth like
SQL> with t as (
  select dbms_xmlgen.getxmltype('select * from dept where rownum =1') xml from dual
--   generate some sample xml
select xmltype('<?xml version = ''1.0''?>
  <?xml-stylesheet href="../xsl_path/My_StyleSheet.xsl" type="text/xsl"?>' || xml)  xml from t
XML                                                                            
<?xml version="1.0"?>                                                          
<?xml-stylesheet href="../xsl_path/My_StyleSheet.xsl" type="text/xsl"?>        
<ROWSET>                                                                       
  <ROW>                                                                        
    <DEPTNO>10</DEPTNO>                                                        
    <DNAME>ACCOUNTING</DNAME>                                                  
    <LOC>NEW YORK</LOC>                                                        
  </ROW>                                                                       
</ROWSET>                                                                      
1 row selected.