Re: Addressing ISSUE-64 and ISSUE-65

On Wed, Aug 10, 2011 at 12:40 PM, Ivan Herman <ivan.herman@gmail.com> wrote:

>
> On Aug 10, 2011, at 19:28 , David McNeil wrote:
>
> >
> > can you give me a real use-case where there is a need of multiple foreign
> keys from the same columns.
> >
> > Juan - This raises the question in my mind: is it a requirement for the
> Direct Mapping to capture all of the FK relationships? My assumption was
> that we wanted the Direct Mapping to capture all of them and would be
> considered a failure if it dropped some of them (would there be a
> deterministic way to identify which one to drop?). But from your question it
> seems that it is OK for a FK to be dropped and it is just a question of how
> common the scenario is.
>
> Yes, that question came to my mind, too. It is not sure that our goal with
> the DM is to map _all_ possible RDB-s. It may be that we should concentrate
> on that 80/20 case if the result is well manageable, with decent URI-s, etc.
> After all, we do have R2RML for the more esoteric cases...
>

+1

>
> Ivan
>
> > In that case I would say it is not very common.
> >
> > Regarding ISSUE-65, it seems useful to me that the presence of a FK is
> purely additive in terms of the triples produced. So I agree with Souri's
> points and recommendation.
> >
> > -David
>
>
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
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