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Analogue to SQL Server UniqueIdentifier?

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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.

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