Re: OO database?

After a long battle with technology, db(at)traceroute(dot)dk (Socketd), an earthling, wrote:
> Hi all
>
> I can see Postgresql calls itself a "object-relational database
> management system", but what's the object part of it?
>
> I have found inheritance, but are there more OO features in postgresql?

It offers "method dispatch" where the system can invoke different
methods dependent on the types of values passed into a function.
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select 'cbbrowne' || '@' || 'acm.org';
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Q: What does the function NULL do?
A: The function NULL tests whether or not its argument is NIL or not. If
its argument is NIL the value of NULL is NIL.
-- Ken Tracton, Programmer's Guide to Lisp, page 73.