I am using Oracle 12.1.0.2.
What would be encoding of xml generated by
select dbms_xmlgen.getxml ('select * from dual') from dual;
The XML heading just has <?xml version="1.0"?>
My database NLS_CHARACTERSET is WE8MSWIN1252.
Client (Linux 6) does not have NLS_LANG.
$locale LC_CTYPE shows UTF-8