Re: Identity modelling

"mAsterdam" <mAsterdam_at_vrijdag.org> wrote in message news:4314aab2$0$11062$e4fe514c_at_news.xs4all.nl...

> The URL is just an alias for another locator.
> The existence of what is there (at the pointed-at)
> location does not depend on the existence of the URL.

> Real keys do not have things that are existentially
> dependent on them, but my intuition (not checking
> any definitons anywhere) is that primary keys do:
> A tuple (relational value) can only exist /with/ it.

Let's try to use RM for this little problem:

- the URL is a value
- the content of the resource is a value
- there is a relation At(URL, Content) where URL is the primary key with

So the URL is a key after all. :-) Received on Wed Aug 31 2005 - 13:16:58 CEST