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Re: How to restrict conditional cardinalities?

From: Yoshio Fukushige <fukushige.yoshio@jp.panasonic.com>
Date: Fri, 08 Sep 2006 19:32:47 +0900
To: Ivan Herman <ivan@w3.org>
Cc: fukushige.yoshio@jp.panasonic.com, semantic-web@w3.org
Message-Id: <20060908183108.42F0.FUKUSHIGE.YOSHIO@jp.panasonic.com>

Thanks a lot, Ivan.

(I'm always amazed by your quick responses! :-)

On Fri, 08 Sep 2006 11:22:10 +0200
Ivan Herman <ivan@w3.org> wrote:

> Yoshio,
> if my understanding is correct, then what you are asking for is what the
> description logic people call the 'qualified cardinality restriction'.
> And, indeed, you cannot express it in OWL.

Sorry for my awkward English, but you understand me correctly.

Oh, one cannot express it(= qualified number restriction)... orz

> This is one of the features that OWL1.1 guys are thinking of adding to
> OWL in future:
> http://www-db.research.bell-labs.com/user/pfps/owl/syntax-20060614.html
> [Note that, for the time being, OWL1.1 is *not* a W3C work, though it
> may become one, eventually...]

Thank you for the pointer to the exciting new work!

I hope it will reach the maturity to become a W3C work soon.

But with your help, I found Alan and Guus'es Editors Draft (in SWBPDWG): 
Qualified cardinality restrictions (QCRs):  Constraining the number of values of a particular type for a property [1]
(though it hasn't reached Working Note status yet but remains editor's draft)

I find the "unendorsed" "valuesFrom" property very nice and would like to use it for the time being.

But which namespace should I use for that?

Is there any de facto namespace, any suggestions?

[1] http://www.w3.org/2001/sw/BestPractices/OEP/QCR/


Yoshio Fukushige <fukushige.yoshio@jp.panasonic.com>
Network Development Center,
Matsushita Electric Industrial Co., Ltd.
Received on Friday, 8 September 2006 10:31:57 UTC

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