Re: E/R modeling: relationship's attributes

U-gene wrote:
> ... it tryes to describe some enterprise, its
> entitites, relationships ets, what exist in real world ...

Do you understand the difference between the model and the real world?

(Prof Krasnoselsky used to puzzle his students with a linear control system that was supposed to output the input signal shifted forth in time -- predict the future in other words. After a humble student's attempt to explain that such system would be unstable prof asked such question. I interpret it as a retorical question that ends the discussion.) Received on Thu May 04 2006 - 11:07:48 CDT