Analogue to SQL Server UniqueIdentifier?

Hi

My porting experiment has encountered the SQL Server UniqueIdentifier problem. I can see one or two suggestions about this have been made over the years but I'd like to try and stay close to the original. So:

I'm wondering if I can use a combination of a domain 'hack' for syntatic compatibillity and an externally implemented function to handle generation.

More specifically, given a table defined thus:

CREATE TABLE jazz(
UUID UniqueIdentifier DEFAULT newIdentifier(),
rootname VARCHAR(255),
data_source VARCHAR(1024),
date_created DATETIME DEFAULT GETDATE())

1. Can I handle the UniqueIdentifier datatype via a domain that aliases UniqueIdentifier to char(X) (for example) ? This seems to work fine for the DATETIME datatype.
2. Implement newIdentifier() in some extension DLL that simply calls CoCreateGUID() ?

or does uuid-ossp do this for me?

Thx.

Jerry.