Re: Queries and OO

From: Daniel Parker (danielaparker_at_spam?nothanks.windupbird.com)
Date: 01/16/05 

Date: Sun, 16 Jan 2005 09:35:02 -0800

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
news:1ruf0yjfwqi17.1klvsv9x3cidf.dlg@40tude.net...
>
> I'd say that querying is rather about some specific implementation than
> modeling. This kind if implementation forces you to have a very flat type
> hierarchy with a limited set of available operations. It might be OK for
> some applications and absolutely unsuitable for others. Of course it does
> not mean that a query language cannot be complete (in Turing sense etc),
> just it is a very low-level abstraction as compared with OO approach.
>
Generally, to be able to query a set of entities requires that those
entities have some kind of structure, and to be able to apply logical
operations requires theoretical foundations. Surely systems that bring that
type of structure and come with firm foundations cast in calculi would be
considered _higher_ level abstractions than a so-called OO approach, where
the entities of discourse appear to have very little structure.

Regards,
Daniel Parker