Re: No exceptions?
From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 03 Jul 2006 02:52:23 GMT
Message-ID: <HD%pg.116039$Mn5.62191_at_pd7tw3no>
>> Bob Badour wrote:
>> ...
>>
>>> Any two values of differing most-specific-types are unequal. Thus, if
>>> x and y each have an attribute z where the types are different, the
>>> join will have cardinality zero and will have an attribute z with the
>>> most specific supertype of the z attributes in x and y. This might be
>>> the universal supertype.
>>> ...
>>
>> Thanks very much for that. The word 'if' in 'if x and y each have an
>> attribute ... ' might be at the centre of my question. Will ponder
>> that, it might be the first time that anybody has tried to tell me in
>> terms that I could dig why some OO notions might be important.
>
> Which OO notions would those be?
Date: Mon, 03 Jul 2006 02:52:23 GMT
Message-ID: <HD%pg.116039$Mn5.62191_at_pd7tw3no>
Bob Badour wrote:
> 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?
Inheritance and inheritance.
p Received on Mon Jul 03 2006 - 04:52:23 CEST