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Re: Lists of Values

From: Guus Schreiber <schreiber@cs.vu.nl>
Date: Thu, 10 Jun 2004 15:50:51 +0200
Message-ID: <40C8673B.2090006@cs.vu.nl>
To: Alan Rector <rector@cs.man.ac.uk>
Cc: best-practice <public-swbp-wg@w3.org>

Alan Rector wrote:

> All
> While at Stanford, Natasha and I also discussed the issues of representing 
 > lists of values, either as partitioning classes or as all different
 > individuals.
> I have now put a short paper at  
 > http://www.cs.man.ac.uk/~rector/swbp/lists_of_values_v0_1.html
 > and a pdf version at
 > http://www.cs.man.ac.uk/~rector/swbp/lists_of_values_v0_1.pdf .
> (There are some odd glitches in the styles, and the html doesn't always 
> print out correctly although it comes out fine on the screen, 
 > at least on my machine.)

Just got around to reading this. Well put. I agree that approach 1 is 
counterintuitive for many, but works often best in semantic-web practice 
(also without the OWL DL / reasoner arguments).

Actually, we do exactly the same in our solution to the "classes as 
values" issue, see my initial response to Bernard:

  Excerpt from:
Assume we have a painting for which
we want to define the style/period value of "Cubism". Cubism is a class
in one of the subtrees, so it would not be a legal value. Instead, we
store an anonymous instance of "cubism". In fact, there is something to
be said for this solution: the style of a painting is not cubism but
some expression of cubism. Likewise, a painting is not "blue" but some
expression of blue.

We also use it, like Alan, to handle partitions of the value space, e.g. 
analytic and synthetic cubism.

I have a naming suggestion. "Tall" in approach 1 is in fact 
fundamentally different from "Tall" in approach 2. It may be better to 
talk about "Tall value" in approach 1. This makes also clear why there 
is a subclass relation between "height value" and "tall value" and not 
an instance relation.


> Natasha and I had some discussion of titles and what to call things.  
 > I settled for the paper on "lists of values" as neutral with
 > "value partitions" for the version using classes and "value sets"
 > or the version using individuals.  Further suggestions welcome if
 > we can make clear what the purpose is.
> --
> Alan L Rector
> Professor of Medical Informatics
> Department of Computer Science
> University of Manchester
> Manchester M13 9PL, UK
> TEL: +44-161-275-6188/6149/7183
> FAX: +44-161-275-6236/6204
> Room: 2.88a, Kilburn Building
> email: rector@cs.man.ac.uk
> web: www.cs.man.ac.uk/mig
>         www.opengalen.org
>         www.clinical-escience.org

Free University Amsterdam, Computer Science
De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands
Tel: +31 20 444 7739/7718
E-mail: schreiber@cs.vu.nl
Home page: http://www.cs.vu.nl/~guus/
Received on Thursday, 10 June 2004 09:50:55 UTC

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