Re: A simple situation shows confusion about basic concepts
Date: Wed, 27 Oct 2004 02:25:42 -0400
Message-ID: <10nufsc6l7ro1ad_at_corp.supernews.com>
> Thank you for your replies, fellows. It seems I may have got you confused
> with the attribute 'relation_type' in the KB entity. That has nothing to
> do with relationships between tables in the database model. Its purpose is
> to specify the type of *conceptual* relationship the two UCs of a KB entry
> have, e.g. the concepts of "car" and "vehicle" have a "is a"
> relation_type. From his comment above, it seems Laconic2 understood it,
> while I am not so sure Kostas did.
I think everybody understood that crystal clear. :-) You have what Alan says, a rectangle for the UC relation and the diamond that relates UC to itself, which as I said is a reflexive association.
Regards,
Konstantinos
Received on Wed Oct 27 2004 - 08:25:42 CEST