Is "CREATE DOMAIN" in 6.3 ??

Hi:
Is create domain command implemented in 6.3??
I am trying to use
create domain employed as char(10)
check (
value = "YES" or
value = "NO" or
value = "RETIRED" or
value = "DISABLED" or
value is NULL
);
in SQL scripts but is failing in 6.2.1 postgresql.

I can find work around BUT there are tons of create domains in my SQL
scripts and will be very tedious.
By the way, create domain is in defined in SQL 92
see this chapter 42 in
http://sunsite.unc.edu/LDP/HOWTO/Database-HOWTO.html

al
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