AL32UTF8 - "appropriate", or essential ?

The Oracle documentation says that AL32UTF8 is "appropriate" for storing XML data. Does appropriate mean required ?
If someone has an Oracle database set to a different, or a single byte character set, can they still use XML - provided they only insert single byte data, or must they upgrade to AL32UTF8 ? What impact is there for changing a character set on running applications ? Is it a re-install, or is it just a config setting change ?
The concern is, if an application is developed using Oracle XML, and a potential customer's database isn't set to AL32UTF8, can they still use the application, or will the application simply not run.
Thanks,
Andy Mackie.

Basic rule of thumb. All of the characters in the XML Document must be natively representable in the chosen database character set. Eg you can not use entity escaping to try to represent a character set that the database character set does not support.
In general changes in the database character set should be transparent to an application. However be aware that there are some potential issues. 2 in particular are CLOB data will be stored as UCS2 in an ALT32UTF8 database. This basically means that you will double the number of bytes required to store CLOB data. The other one that can very occassionally byte is the case where a single byte character in the original character set maps to a 2 byte character in the AL32UTF8 database character set. This can cause a problem in the rare case where for instance you have a varchar2(32) containing 32 characters in your single byte character set database. If you convert to AL32UTF8 and one of those characters requires 2 bytes to represent in AL32UTF8 you will need to alter the size of the VARCHAR2 column to accomodate the extract data. Note this is extremely rare in the UK, USA, happens occasionally in Europe, paricularly with some of the Eastern European Character sets.

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