Re: The Database that Understands What It's Told

> You know there are suprisingly few clear web resources to illustrate
> just why a navigational/graph model is flawed...

Something contradictory here.

Per JayDee, "The most resilient designs are those which accurately represent data, not relationships. In that vein, I've found Halpern's ORM approach to be helpful"

Per Bob, "NIAM, nijssen and halpin. They set the reference point for conceptual modelling about 20 years ago. Since that time, I have seen nothing I would consider a groundshaking improvement;" from "IDJIT! Your Data Model Can't Posssibly Work!"

Dbd implements the fundamental parts of ORM/NAIM:

You can compare the diagram for (bob friend tom) with those in fig 6 at

http://essentialstrategies.com/publications/modeling/niam.htm

You can compare the diagram for (bob (friend at home) sam) with fig 7 at
http://essentialstrategies.com/publications/modeling/niam.htm

Are ORM/NAIM nav/graph models? If so are they flawed as you say or near perfection according to JayDee and Bob? Received on Tue Aug 01 2006 - 21:02:06 CEST