Re: Database-valued attributes?

"Paul Vernon" <paul.vernon_at_ukk.ibmm.comm> wrote in message news:boquvj$1o30$1_at_gazette.almaden.ibm.com...
> "Bob Badour" <bbadour_at_golden.net> wrote in message
> news:srWdneQR1as5SC2iRVn-hg_at_golden.net...
> > All you have done is describe a data type with a possrep consisting of
two
> > RVA's. Such a data type is perfectly acceptable. The equivalent of a
> > "database value" with multiple views would be a similar type with
multiple
> > possreps.
>
> Q. Do D&D explicitly define what a possiable representaion is. I.e. is a
> poss rep with more than 1 component a tuple of those components, or a
list,
> a set, an array or just 'a thing with components'?

It is a possible representation. The remainder is internal.

> E.g. would
>
> POSSREP XY_POINT { X NUMERIC, Y NUMERIC }
>
> be the same poss rep as
>
> POSSREP XY_POINT { Y NUMERIC, X NUMERIC }
>
> in thier book?

They would have to be the same unless they are representations of different types. Received on Tue Nov 11 2003 - 17:49:30 CET