XMLAGG with RTRIM issue

Currently I have the following query:

SELECT 
    CASE 
       WHEN ('[Param.3]' = 'SELECTED')
          THEN (SELECT RTRIM(XMLELEMENT("Rowset", XMLAGG(RW.R ORDER BY RW."ID")), ' ' ) AS Orders
                FROM TMTABLE UL, XMLTABLE('Rowsets/Rowset/Row' PASSING UL.TEXT COLUMNS "ID" NUMBER(19) PATH 'ID', R xmltype path '.') AS RW
                WHERE ID BETWEEN '[Param.1]' and '[Param.2]')
       WHEN ('[Param.3]' = 'ALL' )
          THEN (SELECT RTRIM(XMLELEMENT("Rowset", XMLAGG(RW.R ORDER BY RW."ID")) , ' ' ) AS Orders
                FROM TMTABLE UL, XMLTABLE('Rowsets/Rowset/Row' PASSING UL.TEXT COLUMNS "ID" NUMBER(19) PATH 'ID', R xmltype path '.') AS RW)
    END AS Orders
FROM 
    dual

This query is working fine if there are small number of XML rows to be merged into single row with XML AGG. But if the number of XML Rows to be merged are higher, this query is throwing the following error:

ORA-19011: Character string buffer too small

What change do I need to apply to make this work?