Re: No exceptions?
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Sun, 02 Jul 2006 22:45:43 GMT
Message-ID: <r0Ypg.5377$pu3.121668_at_ursa-nb00s0.nbnet.nb.ca>
>
> Thanks very much for that. The word 'if' in 'if x and y each have an
> attribute ... ' might be at the centre of my question. Will ponder
> that, it might be the first time that anybody has tried to tell me in
> terms that I could dig why some OO notions might be important.
Date: Sun, 02 Jul 2006 22:45:43 GMT
Message-ID: <r0Ypg.5377$pu3.121668_at_ursa-nb00s0.nbnet.nb.ca>
paul c wrote:
> Bob Badour wrote:
> ...
>
>> Any two values of differing most-specific-types are unequal. Thus, if >> x and y each have an attribute z where the types are different, the >> join will have cardinality zero and will have an attribute z with the >> most specific supertype of the z attributes in x and y. This might be >> the universal supertype. >> ...
>
> Thanks very much for that. The word 'if' in 'if x and y each have an
> attribute ... ' might be at the centre of my question. Will ponder
> that, it might be the first time that anybody has tried to tell me in
> terms that I could dig why some OO notions might be important.
Which OO notions would those be? Received on Mon Jul 03 2006 - 00:45:43 CEST