Foreign key referencing subclasses.

Hi,

it seems I can't have a foreign key that references some subclass.  Postgres
says it can't figure out what its primary key is.  The primary key is defined
in the superclass.

I have something like this:

CREATE TABLE resource_record( rrid SERIAL -- etc.
);

CREATE TABLE soa_record( -- blah, blah
) INHERITS(resource_record);

CREATE TABLE domain( -- ... soaid REFERENCES soa_record  -- *
);


* = This doesn't work. I can reference resource_record here, but I can not   reference soa_record that way. Referencing resource_record* doesn't work   either.

-- 
johs