Is Inheritance in RM possible?

Does inheritance currently exist in RMDBMS anyhwere? I'm not referring
here to OO or O-R databases, but rather the addition of the
functionality in an RM system. Is it even possible or at odds to the
underlying principles of the model?

I have heard mention of the INHERITS keyword in Oracle and PostreSQL
but having only very limited experience with the respective products, I
have no idea of the extent or relevance of its functionality.

I've also encountered Darwen's proposal for an inheritance model via a
google seach, and a trawl to thethirdmanifesto.com, but outside that I
am need of illumination. Any experiences of those in this group are
much appreciated.

All best, Jim.

.

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