domains and serial

[BillR <iambill(at)williamrosmus(dot)com>]

Is it not possible to set up a domain using this construct?  I will have 
a lot of tables using integer and big integer types as primary key 
identifier fields.  It would make things simpler if I can use the serial 
construct in a domain instead of using an int or bigint in the domain, 
and then change each field in each table requiring a serial or bigserial 
construct.

I just tried to create a domain using a bigserial type. 

CREATE DOMAIN Identifier_DM AS bigserial;

I received the error message:

ERROR: type "bigserial" does not exist
SQL state: 42704

I tried to run this in both pgadminIII and in data architect 3.5.

Thanks.