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Issue: Feature decision for compliance level 1: cardinality restrictions

From: Deborah McGuinness <dlm@KSL.Stanford.EDU>
Date: Wed, 22 May 2002 21:27:52 -0700
Message-ID: <3CEC6FC8.3E3305E0@ksl.stanford.edu>
To: Webont <www-webont-wg@w3.org>

Issue:  Feature decision for compliance level 1:  cardinality
restrictions

Description: Compliance level 1 – a subset of the full owl language –
needs a decision concerning cardinality restrictions.  The last proposal
[1] included the ability to state functional roles – thus there is a way
to make a max cardinality 1 and min cardinality 0 restriction.
It lacked further cardinality features.  Requests (e.g., [2]) have been
made for more expressive power with respect to cardinality.

The choices are to:

1 – include only functional roles (thus allowing max cardinality 1 and
min cardinality 0).
2 –add min cardinality 1
3 –add max cardinality 0
4 – combine 2 & 3
5 – allow full min and max cardinality  (i.e., min / max cardinality n)

Note, it is not advised to add full cardinality without some kind of
local range restriction.  However, max cardinality 0 and min cardinality
1 on global roles may be of some use.

Raised by:  Deborah McGuinness
Date:  May 22, 2002
Status: Raised
References:
[1] http://lists.w3.org/Archives/Public/www-webont-wg/2002May/0095.html
[2] http://lists.w3.org/Archives/Public/www-webont-wg/2002Apr/0311.html

--
 Deborah L. McGuinness
 Knowledge Systems Laboratory
 Gates Computer Science Building, 2A Room 241
 Stanford University, Stanford, CA 94305-9020
 email: dlm@ksl.stanford.edu
 URL: http://ksl.stanford.edu/people/dlm
 (voice) 650 723 9770    (stanford fax) 650 725 5850   (computer fax)
801 705 0941
Received on Thursday, 23 May 2002 00:28:39 GMT

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