[cc-metadata] How to negate cc:permits, cc:prohibits, cc:requires?
Patrick Peiffer
peiffer.patrick at gmail.com
Fri Jun 19 18:39:36 EDT 2009
Hi,
I'm definitely not a semantic web specialist but these "Open World vs.
Closed World issues" were raised in the W3C team comment on ccREL,
http://www.w3.org/Submission/2008/02/Comment
Is this a liability for integrating ccREL into an RDFS / OWL sematic
environement?
If yes, what does it take to change that? Nathan, how far did you go with
OWL and what stopped you?
Best, Patrick Peiffer
cc-Luxembourg
On Fri, Jun 19, 2009 at 10:37 PM, Christoph Lange <
ch.lange at jacobs-university.de> wrote:
> Hi Nathan,
>
> On Fri, Jun 19, 2009 at 7:14 PM, Nathan
> Yergler<nathan at creativecommons.org> wrote:
> > If there are revisions we should consider, I'd be open to proposals.
>
> thanks for your explanations. As far as my own work with ccREL is
> concerned, my concerns were mostly theoretical, as I expect most of
> our mathematical documents to use the standard CC licenses.
>
> > In all the CC licenses, if Commercial Use is not explicitly
> > prohibited, it is considered allowed. We've previously looked at
> > expressing this sort of additional information with OWL but haven't
> > released anything.
>
> However, I think that this kind of negation as failure is not
> consistent with the open world assumption made by OWL and RDFS. If
> Alice defines a custom license L in one of her documents and wants to
> say that commercial use is allowed, her only choice is to say nothing,
> i.e. to leave the RDF triple "L cc:prohibits cc:CommercialUse" out.
> But what if Bob somewhere else on the web says "L cc:prohibits
> cc:CommercialUse", and then some crawler crawls both Alice's and Bob's
> definitions?
>
> For that reason, I think it would be better to explicitly be able to
> state negative facts. Depending on how this is implemented in OWL,
> one would be able to say in the ccREL ontology that e.g. "prohibits X"
> and "permits X" contradict each other. Then, in the scenario outlined
> above, it could still happen that Alice's and Bob's contradicting
> facts are merged together, but then any reasonable semantic web
> software would _report_ this contradiction.
>
> Not sure if you agree with that reasoning, and, if so, what you'd like
> to do. There is not so much traffic on this list, are there any
> semantic web experts around?
>
> Cheers,
>
> Christoph
>
> --
> Christoph Lange, http://de.wikipedia.org/wiki/Benutzer:Langec, ICQ#
> 51191833
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