Re: object algebra
Date: Sat, 28 Feb 2004 16:31:48 -0500
Message-ID: <UrmdnTJ4H-BildzdRVn-jw_at_golden.net>
"Drago Ganic" <drago.ganic_at_in2.hr> wrote in message
news:c1qvlo$agh$1_at_sunce.iskon.hr...
>
> "Neo" <neo55592_at_hotmail.com> wrote in message
> news:4b45d3ad.0402242201.72ab2c26_at_posting.google.com...
> > > If Mary has no eyes, then the definition of a person as having eyes is
> > > flawed.
> >
> > Are you saying the following set is valid or allowed in RDM?
> > Color = {Red, green, blue, "Not Applicable", "Unknown"}
> >
> > Is "Not Applicable" a color?
>
> This question is really a good one and was not answered well !!
>
> Domain should be from the problem space (semantics).
If the business regularly collects data involving unknown or inapplicable eye colors, what's wrong with the semantics somewhat suggested by the names above? (One would need to know the operations to know the exact semantics.) Received on Sat Feb 28 2004 - 22:31:48 CET