SQL & PL/SQL

Hello guys,

I have a weird problem. Imagine the following scenario...

CREATE TABLE my_body_test
(
  id number(10), 
  rnk NUMBER(10),
  body VARCHAR2(1000)
);

INSERT INTO my_body_test VALUES(1, 1, 'Hello ');
INSERT INTO my_body_test VALUES(1, 2, 'World [');
INSERT INTO my_body_test VALUES(1, 2, CHR(12));
INSERT INTO my_body_test VALUES(1, 2, ']!!');

DROP TABLE my_body_test;

I would like to aggregate the content of the column body. I can't une SYS_CONNECT_BY_PATH because the body contains a lot of data and can be more than 4000 chars. So, I do it this way:

SELECT id, 
       dbms_xmlgen.convert(xmlagg(xmlelement(e, body) ORDER BY rnk ).extract('//text()').getClobVal(), 1)
  FROM my_body_test
 GROUP BY id;

But I have the following error.

ORA-31011: XML parsing failed
31011. 00000 -  "XML parsing failed"
*Cause:    XML parser returned an error while trying to parse the document.
*Action:   Check if the document to be parsed is valid.

I know it's because of the third row inserted [CHR(12)]. But is there any way to fix this?? I'm using 10g (LISTAGG is not an option).

Thanks for your advice,