Re: Transformation of object modells to relational structures
Date: 1996/06/06
Message-ID: <4p5bcp$bhj_at_wormer.fn.net>#1/1
answers_at_ix.netcom.com(Steve Long) wrote:
>Or is it that you do not understand ERDs?
Umm, well. I have been earning my income as a Data Moder (or Data
Analyst, or Data Administrator) for almost 11 years now. I was ERD
data modling before CASE tools were even heard of (which was before I
was being paid for it). I have been exposed to at least 10 different
ERD modeling representations (some of which, I must admit, I now
forget). And (if the above isn't enough) I participated in the USAF
contract that extedned the IDEF-1 modeling paradigm into IDEF-1X
(which is what ERWin uses as its default diagrammatic technique).
>Can you substantiate your statement? Provide an object model that is
>not equivalent to an ERD with an extention of adding methods as a
>counter example and your statement will have more merit than mere
>opinion.
Sure, the one that made me realize the difference was the Fusion modeling paradigm (as created by the firm: Object Space). I even had one of the representitives of that firm tell me to my face that representing data requirements based on existence is diametrically opposed to the Object modeling approach which represents data requirements based on common (or different) 'responsibilities' (meaning functional responsibility).
>Steve
>804-262-6332
you didn't really want me to call you, did you?
(if so, can I reverse the charges?)
>--------------------
'Keystroke'
KeystrkTX_at_AOL.COM
Received on Thu Jun 06 1996 - 00:00:00 CEST