Questions around use of thesaurus and synonyms

Question

Q1. Does thesaurus support Japanese/Chinese/Korean? The document didn't say no. But didn't confirm it explicitly.
Q2. For ctxload to load a thesaurus import file, what encoding should be the file? UTF-8?
Q3. Is synonym relation reflextive in Oracle Text? After define EUR is Euro, should I define Euro is EUR?
Q4. From the document, when I define a synonym, I cannot specify language. If I define a synonym between 'USD' and 'US Dollar'. And when I query I use SYN(USD), will this expand into 'USD,US Dollar' no matter what language is the document?

Answer 1

Here are some information which may answer your questions
Ans1)
We have a limitation for language specific character sets
You can only add knowledge bases for languages with single-byte character sets.
You cannot create a knowledge base for languages which can be expressed only in multibyte character sets.
I think Japanese/Chinese/Korean are represented in multi byte character sets, so we cannot.
Ans2) Supplied knowledge bases with Oracle text are in WE8ISO8859P1. You can store an extended knowledge base in another character set such as US7ASCII.
Knowledge bases can be in any single-byte character set.
Ans 3) No you dont need to.It is reflexive.
you can check the following example
create table test(id number, text varchar(20));
insert into test values (1, 'os');
insert into test values( 2, 'operating system');
insert into test values(3, 'windows');
exec ctx_thes.create_thes('my_thes',FALSE);
exec ctx_thes.create_phrase('my_thes','os');
exec ctx_thes.create_phrase('my_thes','operating system');
exec ctx_thes.create_relation('my_thes','os','SYN','operating system');
declare
syno varchar2(50);
begin
syno := ctx_thes.syn('os','my_thes');
dbms_output.put_line('the synonym of os is : ' || syno);
end;
--o/p is the synonym of os is : {OS}|{OPERATING SYSTEM}
declare
syno varchar2(50);
begin
syno := ctx_thes.syn('operating system','my_thes');
dbms_output.put_line('the synonym of operating system is : ' || syno);
end;
--o/p is the synonym of op sys is : {OPERATING SYSTEM}|{OS}
Ans 4) I think you are trying to say the following
you have a thes file..say in spanish
and you have an entry in that file for USD Syn in English...
you want to ask whether still Oracle can return SYN(USD) = 'USD,US Dollar'
Am I right?