Conversion from SQL server to db2

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DB2

can you please help me to how to convert below sql server function to db2 format.

CREATE FUNCTION [dbo].[GetKeyStructureXml]
(

@pf_wkstn_oid_sh smallint,

)

RETURNS varchar(max)

AS
BEGIN

DECLARE @RtKeys varchar(Max)

set @RtKeys = (SELECT rt.rbase_field_name,
pf_wkstn_oid_sh,
pf_wkstn_oid_lng,
''N'' status_indc,
rt.field_data_type,
rt.field_size,
''Rate Key '' DisplayType,
'''' Author,
0 DateCreated,
rb.field_level_indc,
rb.field_scope_indc
FROM rt_tmplt_key rt inner join rbase_field_dict rb
on rb.rbase_field_name=rt.rbase_field_name
where pf_wkstn_oid_sh = @pf_wkstn_oid_sh
order by rt_key_sqnc_num asc
FOR XML AUTO, BINARY BASE64,root(''TableKeys''))
RETURN @RtKeys;

END;

please provide some guide and help for the above conversion. it is quite confusing to use XML AUTO and BINARY BASE64 in db2.

What I have tried:

i have tried in XMLSERIALIZE but not able to get the result.

please provide how to create a xml node in db2.