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A problem with the proposed diagram in the RDF-Based Semantics

From: Michael Schneider <schneid@fzi.de>
Date: Mon, 17 Nov 2008 12:04:20 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A0E067C2@judith.fzi.de>
To: "Jie Bao" <baojie@cs.rpi.edu>
Cc: "W3C OWL Working Group" <public-owl-wg@w3.org>
Hi Jie!

A while ago, in your review of the RDF-Based Semantics you proposed adding a
diagram to the document's introduction, to visualize the relationships that
hold between the different parts of the OWL 2 Full universe [1]. There is an
EdNote in the working draft since that time. At the weekend, I tried to
create a sketch of the diagram, and found a problem: There are a lot of
pretty different ways to draw these relationships. 

For example, the sets of data properties and annotation properties may be
disjoint, or may overlap, or the one can be subsumed be the other,
respectively. And when the other "basic sets" are also taken into account, a
lot of different (and meaningful) combinations exist. The idea was that the
diagram should at least show the "general situation". But there is not
really such a "most general" situation. 

My main concern is that this diagram would become the de-facto reference
diagram to show the parts of the OWL 2 Full universe, since it would be part
of the spec. The configuration we would eventually settle on would then be
what many people would believe is "generally the case"... but it would
actually be "generally wrong". :(

So I would rather opt to not add such a diagram to the document.

Note: The diagrams in the RDF Semantics spec do not have this problem. They
show /concrete examples/ of interpretations.


[1] <http://lists.w3.org/Archives/Public/public-owl-wg/2008Sep/0192.html>

Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Email: Michael.Schneider@fzi.de
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Received on Monday, 17 November 2008 11:05:03 UTC

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