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@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 Sun Jul 02 2006 - 17:45:43 CDT