XML view need to be modify -- help needed

Question

Hi,
Please help me to modify this query to get the desired output specified as under.
Actually i need to create a view which can result the XMLTYPE.getClobVal() , so required in one row.
And I have used case to add different XML tags in between as per validation_id in table.
Suggest any other best method to do this.
Kindly revert me urgently.
-Ajay
Thanks in advance.
Query:-
select case when d.validation_id='LIST'
then xmlagg(xmlelement(validation,xmlattributes('VALUESET' as "name"),xmlelement(parameter,xmlattributes('VALUESETNAME' AS "name", d.value_1 as "value" , d.app_id as "externalSource"))))
when d.validation_id!='LIST' then xmlagg(xmlelement(validation,xmlattributes(d.validation_id as "name",c.error_message as "errrorMessage")))
end from data_valid_xref d, table_definition t, data_valid_cfg c
where t.column_name='check' and t.column_name=d.column_name and d.validation_id=c.validation_id
group by d.validation_id
<VALIDATION name="FORMAT" errrorMessage="Format validation failed"></VALIDATION>
<VALIDATION name="LESS" errrorMessage="Less validation failed"></VALIDATION>
<VALIDATION name="VALUESET"><PARAMETER name="VALUESETNAME" value="value_one" ext
ernalSource="COMMON"></PARAMETER></VALIDATION>
3 rows selected.
Desired output
<valueset>
<VALIDATION name="FORMAT" errrorMessage="Format validation failed"></VALIDATION>
<VALIDATION name="LESS" errrorMessage="Less validation failed"></VALIDATION>
<VALIDATION name="VALUESET"><PARAMETER name="VALUESETNAME" value="value_one" ext
ernalSource="COMMON"></PARAMETER></VALIDATION>
</valueset>
1 rows selected.

Answer 1

You can add XMLAGG function to the output XML rows. Try this.
SELECT xmlagg(xmlcol)
FROM
  (SELECT(
   CASE
   WHEN d.validation_id = 'LIST' THEN xmlagg(xmlelement(validation,    xmlattributes('VALUESET' AS
     "name"),    xmlelement(parameter,    xmlattributes('VALUESETNAME' AS
     "name",    d.value_1 AS
     "value",    d.app_id AS
     "externalSource"))))
   WHEN d.validation_id != 'LIST' THEN xmlagg(xmlelement(validation,    xmlattributes(d.validation_id AS
     "name",    c.error_message AS
     "errrorMessage")))
   END) xmlcol
   FROM data_valid_xref d,
     table_definition t,
     data_valid_cfg c
   WHERE t.column_name = 'check'
   AND t.column_name = d.column_name
   AND d.validation_id = c.validation_id
   GROUP BY d.validation_id)