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[Enrico Silterra <es287 AT cornell.edu>]

I asked this a couple of days ago, but I think that I was not very clear.
The RDF schema, seems, to me, to require that each possible operation be
created twice, once as a Permission, and once as a Prohibition.
This is because the range of the permits property  is .... Permission.
and the range of the prohibits property is Prohibition.

1) Am I misunderstanding the use of the range?
2) Do I need to create my various new Actions twice, once as Prohibitions, 
once as Permissions?
3) If I make a new class, Action, and make it a subclass of both 
Prohibition, and of Permission,
can I then create my actions only once?
Still confused, and tia for any clarification.
Cheers,
Rick


At 12:21 PM 4/26/2004 -0400, Enrico Silterra wrote:
> I am a little unclear on the range of the prohibits, permits
> properties.
>
> I am proposing to encode a set of data base permissions in
> RDF/CC, some thing like this:
>
> There is a permission to interlibrary loan via fax
> So,
> I would create
> <Permission rdf:about="http://www.ermi.example/ermi/InterLibraryLoanFax";>
>         <dc:title>Ill load via fax</dc:title>
>         <dc:description>Inter Lib Loaning via fax</dc:description>
>     </Permission>
>
> But? Sometimes loaning  is forbidden.
> Do I need to create a corresponding prohibition?
> <Prohibition rdf:about="http://www.ermi.example/InterLibraryLoanFax";>
>         <dc:title>Ill load via fax</dc:title>
>         <dc:description>Inter Lib Loaning via fax</dc:description>
>     </Prohibition>
>
> Am I missing something?
> What if someone AllowsCommercialUse?
> The schema seems to me to say, that since this is a Prohibition, it can not
> be the target of permits, that one can never allow this?
>
>
> The fact that the range of the permits property is permissions,
> and the range of prohibits is prohibitions,
> seems to require that the same "Actions" be entered into the schema twice?
>
> Of course, in reality, I have been unable to find an RDF validator that 
> actually enforces the
> range of the permits, or prohibits, so I never find any syntax errors 
> during "validation".
>
> confusedly yours,
>
> Rick Silterra

******************************
Enrico Silterra
Meta Data Engineer
107-E Olin Library
Cornell University
Ithaca NY 14853

Voice: 607-255-6851
Fax:     607-255-6110
E-mail: es287 AT cornell.edu
http://www.library.cornell.edu/cts/
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