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Re: Review of the "SKOS Reference" Last Call Working Draft [ISSUE-138]

From: Sean Bechhofer <sean.bechhofer@manchester.ac.uk>
Date: Fri, 17 Oct 2008 16:52:33 +0100
Message-Id: <110EE958-1C91-42F3-9014-414D1D596069@manchester.ac.uk>
Cc: SWD Working SWD <public-swd-wg@w3.org>
To: Michael Schneider <schneid@fzi.de>


Dear Michael

Thank you for your comments [1,ISSUE-138]:

"""
Such a kind of functional property characteristics distinguished by  
language
tags cannot be expressed in OWL Full. I suggest to say this somewhere  
in the
document.

Again, I want to hint you to rdf:text, in combination with OWL 2,  
which is going
to allow for specifying data ranges consisting of all plain literals  
having a
given language tag. A somewhat more general feature was the  
resolution of
issue-71 of the OWL WG, accepting this proposal:
<http://lists.w3.org/Archives/Public/public-owl-wg/2008Sep/ 
0053.html>. But,
AFAICS, one would need to build a <=1-qualified cardinality  
restriction (new
feature in OWL 2) on each such language-data range in order to  
simulate a
functional property of the kind above. So this is probably all a bit  
academic.
"""

-------------------------------------------------------------

As you point out, there are some constraints in the SKOS data model  
that we are unable to express in OWL (some of these /may/ be  
addressed by OWL 2, but in the current SKOS specification we are  
avoiding reference to work in progress). In such cases, the  
constraints are expressed in prose in the document.

Statements to this effect are made in Section 1.7.1 of the LC draft.  
Do you feel these are sufficient, or do we need to further elaborate  
this point?

The Working Group propose to *postpone* this issue, indicating that  
this may be an area that future groups may wish to return to. Are you  
willing to live with this?

Cheers,

	Sean Bechhofer
	Alistair Miles

[ISSUE-138] http://www.w3.org/2006/07/SWD/track/issues/138
[1] http://lists.w3.org/Archives/Public/public-swd-wg/2008Sep/0044.html

--
Sean Bechhofer
School of Computer Science
University of Manchester
sean.bechhofer@manchester.ac.uk
http://www.cs.manchester.ac.uk/people/bechhofer
Received on Friday, 17 October 2008 15:53:51 GMT

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