Generating mixed case columns for XML using Object views

Question

I am trying to model a query involving joins to generate hierarchical levels for XML document. I model it with an object view with a multicast subquery and the generated XML works fine except the following :
The generated XML creates a tag <view_column_name>_ITEM for the nested multicase subquery columns in the view and all the nested subquery view columns in upper case because the underlying table columns are in upper case. To better illustrate, please see the following example :
CREATE TYPE Tillinstance_t as object (
"Tillinstanceid" number
,"Stationid" number
,"Comment" varchar2(2000)
,"DepositID" number(38)
,"TimestampCreate" date
,"UseridCreate" number
,"TimestampChange" date
,"UseridChange" number
,"TimestampClosed" date
,"UseridClosed" number
,"TimestampBalance" date
,"UserIDBalance" number )
create type insts as table of Tillinstance_t ;
CREATE OR REPLACE VIEW till_view AS
SELECT t.tillid as "TillID"
, t.description as "Descr"
, t.word as "Word"
, t.Scopetypeid as "ScopeTypeId"
, t.displayOrder as "DisplayOrder"
, t.useridcreate as "UserIDCreate"
, t.newid as "NewID"
, t.flagactive as "FlagActive"
, t.timestampcreate as "TSCR"
, t.useridcreate as "UIDCR"
, t.timestampchange as "TSCH"
, t.useridchange as "UIDCH"
, CAST( MULTISET ( SELECT i.Tillinstanceid as "TillinstanceID"
, i.stationid as "StationID"
, i.ocomment as "Comment"
, i.depositid as "DepositID"
, i.Timestampcreate as "TSCR"
, i.useridcreate as "UIDCR"
, i.Timestampchange as "TSCH"
, i.useridchange as "UIDCH"
, i.timestampclosed as "TSCL"
, i.useridclosed as "UIDCL"
, i.timestampbalance as "TSBAL"
, i.useridbalance as "UIDBAL"
FROM TillInstance i
WHERE t.tillid = i.tillid)
AS Insts)
AS "Insts"
FROM ucTill t
The generated XML shows up in the form of :
<?xml version = '1.0'?>
<Tills>
<Till TillID="1002" Descr="Till #3" Word="Till3" ScopeTypeId="8"
DisplayOrder="0" UserIDCreate="296" TSCR="3/26/2001 0:0:0" UIDCR="296"
TSCH="5/4/2001 14:12:32" UIDCH="298">
<Insts>
<Insts_ITEM TILLINSTANCEID="1278" STATIONID="1057" OCOMMENT="Morning Till3"
TIMESTAMPCREATE="3/26/2001 0:0:0" USERIDCREATE="296" TIMESTAMPCHANGE="6/7/2001
8:26:49" USERIDCHANGE="99" TIMESTAMPCLOSED="6/7/2001 8:26:49"
USERIDCLOSED="99"/>
<Insts_ITEM TILLINSTANCEID="1362" STATIONID="1057" TIMESTAMPCREATE="6/7/2001
8:27:13" USERIDCREATE="99" TIMESTAMPCHANGE="6/11/2001 11:32:58"
USERIDCHANGE="320"/>
</Insts>
</Till>
</Tills>
Now How do I stripe out the _ITEM from the generated XML and change the columns TIMESTAMPCREATE, USERIDCLOSED etc to mixed case?
Any idea

Answer 1

I could generate the mixed case columns with no problem. It was my mistake and sorry for the inconvinience.
However I am running into problems modelling a nested hierarchical set of queries with levels more than 2.
Please advise of any sample code available anywhere.
For example I could do :
create table x1 ( id number , f1 varchar2(10));
creat table x2 ( id number , id_x1 number references x1(id) , f1 varchar2(10)) ;
create table x3 ( id number , id_x2 number references x2(id), f1 varchar2(10)) ;
To model this, I did
create type x3_typ as object ( id number, id_x2 number , f1 varchar2(10)) ;
create type x3_typ_t is table of x3_typ ;
create type x2_typ as object ( id number, id_x1 number , f1 varchar2(10), x3_list x3_typ_t ) ;
create type x2_typ_t is table of ref x2_typ ;
create type x1_typ as object ( id number
, f1 varchar2(10) , x2_list x2_typ_t ) ;
create or replace view x3_x2 as
select id , f1 , cast(multiset(select * from x3 ) as x3_typ_t ) as x3_list
If I try to use a view again like as given below, I get the Oracle inconsistent datatypes error.
create or replace view x2_x1 as
select id , f1 , cast(multiset(select * from x3_x2 ) as x2_typ_t ) as x2_list
I there a better way? Am I missing something? Please help.