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Re: Ways to restrict the properties a class may have?

From: Graham Klyne <GK@ninebynine.org>
Date: Fri, 29 Oct 2004 10:40:43 +0100
Message-Id: <>
To: algermissen@acm.org, "www-rdf-interest@w3.org" <www-rdf-interest@w3.org>

It seems to me that using an inference engine of some kind, all that needs 
to be added is some resource that represents a violation.  Then inference 
rules might be used to infer the presence of such in some given 
RDF.  (Maybe that's what Pychinko's Report(), mentioned by Kendall Clark, 
is meant to achieve?)

I don't think it's in the spirit of RDF to close off the properties that 
can be applied to a resource... it seems like saying that one knows all 
there is to be known about some object.  Unrecognized properties can 
(should) be ignored.


At 21:35 28/10/04 +0200, Jan Algermissen wrote:

>I know about the various ways to constrain individual properties, but
>I seem to be unable to find out if there is a standard way of restricting
>the set of properties instances of a given class may 'have'.
>(Like relational tables form classes by grouping attributes)
>Is there an RDF vocabulary for this purpose?
>Hmm....what about owl:minCardinality (and owl:maxCardinality)? Does
>a missing cardinality of a property for a class imply the cardinality of zero?
>Or would relying on that be too application specific?
>Thanks for any help on this.
>Jan Algermissen
>Consultant & Programmer

Graham Klyne
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Received on Friday, 29 October 2004 15:54:19 UTC

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