Migrate/upgrade to support unicode XML

Question

environment:
DB: 9.2.0.4, 9.2.0.5
XMLTYPE on CLOB
we have a new requirement to support full unicode in XML and data. The Oracle9i Database Globalization Support Guide , example Example 5-4 Unicode Solution with Unicode Datatypes hits us perfectly, and it talks about putting data into NVARCHAR2 and NCLOB.
1. Is it possible to set up XMLTYPE to use NCLOB instead of CLOB (for the 9.2.0.5 platform)?
2. It looks like (in reading past forum threads) that there still are some issues in unicode with XMLtype. Do you have any recommendations?
(using shredded types in 9.2.0.n is out because of issues with support for w3c timezone specs for datetime ....)
thanks in advance,

Answer 1

Could you elaborate on this response? I am having trouble inserting an xml document into an xmltype database, and I'm using the AL32UTF8 character set. I receive:
ORA-19202: Error occurred in XML processing
LPX-00217: invalid character 169 (\u00A9)
Error at line 2
The input file has unicode encoded data (©). Here is the insert code:
Create OR Replace Function getClobDocument(
filename in varchar2,
charset in varchar2 default NULL)
return CLOB deterministic
is
file bfile := bfilename('JLEONXDB',filename);
charContent CLOB := ' ';
targetFile bfile;
lang_ctx number := DBMS_LOB.default_lang_ctx;
charset_id number := 0;
src_offset number := 1 ;
dst_offset number := 1 ;
warning number;
begin
if charset is not null then
charset_id := NLS_CHARSET_ID(charset);
end if;
targetFile := file;
DBMS_LOB.fileopen(targetFile, DBMS_LOB.file_readonly);
DBMS_LOB.LOADCLOBFROMFILE(charContent, targetFile,
DBMS_LOB.getLength(targetFile), src_offset, dst_offset, charset_id, lang_ctx,warning);
DBMS_LOB.fileclose(targetFile);
return charContent;
end;
INSERT INTO hdot VALUES(XMLType(getCLOBDocument('browningCUIM.xml','AL32UTF8')));