Re: Entity and Identity

From: Clifford Heath <>
Date: Mon, 28 Sep 2009 14:12:37 +1000
Message-ID: <YIWvm.22383$6f4.18301_at_newsfe08.iad>

Brian wrote:
> You are misrepresenting what I wrote. I did not assert that location
> is part of state. I said that a difference in location constitutes a
> difference in state. I said that because an object that can have
> state can only have one state at a time and because that state can
> only occupy one location at a time. It therefore follows that if
> there is more than one location occupied at a given time, then there
> is more than one object at that time.

I see. Perhaps that's the issue that folk have with the O-O model, that there is no agreed method for identifying two objects as representing the same "thing". It's very hard to reason about a thing when you can't even identify it, so O-O is necessarily lacking the kind of theoretical framework that RM has.  

> Since I clarified my position in a later post, I have to wonder what
> you sought to gain by misrepresenting what I wrote. But then again, I
> should give you the benefit of the doubt: maybe you didn't read the
> clarification.

That's correct, I don't lurk here all the time, and I probably missed some articles in the (long) thread. Perhaps my news server has even dropped some.

Clifford Heath, Data Constellation,
Agile Information Management and Design
Received on Sun Sep 27 2009 - 23:12:37 CDT

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