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RE: Proposed response to Dave Reynolds - questions from HP

From: Jeremy Carroll <jjc@hplb.hpl.hp.com>
Date: Tue, 22 Jul 2003 08:26:16 +0200
To: "Jim Hendler" <hendler@cs.umd.edu>, "webont" <www-webont-wg@w3.org>

> Apologies - due to a cut and paste error, part of my response was
> missing -

Jim, further cut and paste was that the last point was a different RDF Core
issue ...

> - The RDF support within Jena permits users to:
>    - use annonymous nodes as the object of
>      more than one triple
>    - have cycles of anonymous nodes
>    While the syntactic restrictions between, for example,
>    unnamed individuals and descriptions are understandable,
>    it is not clear why OWL DL has not permitted, for example,
>    an unnamed individual to be the object of more than
>    one triple, or an unnamed individual to be the object
>    of a triple of which it is the subject.
>    Please either relax this constraint or offer a rationale.
> I am pasting in here the response that Peter Patel-Schneider sent to
> another comment raising this same issue - his answer can be seen in
> full in [7]
> owlsas-rdfcore-bnodes-restrictions

We agree that there may be cause for concern, but note that the changes
requested would minimally require a major rework of the direct semantics of
OWL DL. (Section 3 of S&AS).

We have created a new issue and postponed it, so that a future group may,
the benefit of deployment experience, assess whether these concerns were
legitimate, and whether the quantity of work required to attempt to address
this issue is motivated.

We are still considering relaxing some of the constraints on bnodes
corresponding to class expressions; however, this does not seem to be your
main concern. We will notify you of any change.

Received on Tuesday, 22 July 2003 02:32:24 UTC

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