DECLARE
   TYPE rectype IS RECORD
   (
      src   VARCHAR2 (10 CHAR),
      trg   VARCHAR2 (10 CHAR)
   );

   TYPE tabtype IS TABLE OF rectype
      INDEX BY PLS_INTEGER;

   v_tab       tabtype;

   v_request   XMLTYPE;
BEGIN
   v_tab (1).src := '10';
   v_tab (1).trg := '11';
   v_tab (2).src := '20';
   v_tab (2).trg := '22';
   -- and so on ...

   SELECT XMLELEMENT (
             "soapenv:Envelope",
             xmlattributes ('http://schemas.xmlsoap.org/soap/envelope/' AS "xmlns:soapenv",
                            'http://www.abc.com' AS "xmlns:web",
                            'http://www.def.com' AS "xmlns:typ"),
             XMLELEMENT ("soapenv:Header",
                         NULL),
             XMLELEMENT ("soapenv:Body",
                         XMLELEMENT ("web:AAA",
                                     XMLELEMENT ("web:BBB",
                                                 XMLELEMENT ("typ:Version",
                                                             '1.0'),
                                                 XMLELEMENT ("typ:DDD",
                                                             XMLELEMENT ("typ:EEE",
                                                                         999),
                                                             XMLELEMENT ("typ:FFF",
                                                                         888),
                                                             XMLELEMENT ("typ:DDDs",
                                                                         NULL))))))
     INTO v_request
     FROM DUAL;

   DBMS_OUTPUT.put_line (v_request.getstringval);
   DBMS_OUTPUT.put_line ('-----------------------------------------------------------------------');

   FOR i IN v_tab.FIRST .. v_tab.LAST                                               -- quick & dirty
   LOOP
      SELECT APPENDCHILDXML (v_request,
                             'soapenv:Envelope/soapenv:Body/web:AAA/web:BBB/typ:DDD/typ:DDDs',
                             xmltype (   '<typ:DDD><typ:EEE>'                          -- this does not work because of the namespace
                                      || v_tab (i).src
                                      || '</typ:EEE><typ:FFF>'
                                      || v_tab (i).trg
                                      || '</typ:FFF></typ:DDD'))
        INTO v_request
        FROM DUAL;
   END LOOP;

--   DBMS_OUTPUT.put_line (v_request.getstringval);
END;