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ISSUE-185: Last Call Comment: Order in Classification Systems

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Date: Wed, 8 Oct 2008 10:08:38 +0000 (GMT)
To: public-swd-wg@w3.org,public-rdf-in-xhtml-tf@w3.org
Message-Id: <20081008100838.D4E506B62C@tibor.w3.org>


ISSUE-185: Last Call Comment: Order in Classification Systems

http://www.w3.org/2006/07/SWD/track/issues/185

Raised by: Sean Bechhofer
On product: All

Raised by Michael Panzer [1]:


5. Order in Classification Systems
----------------------------------

Order in a classification is important, indeed critical. Order is
evident in the juxtaposition of classes, the sequence of main classes,
and the sequence of co-ordinates in a class. Broader and narrower
relationships alone cannot represent order. So, maybe parallel encoding
is necessary to make sure that the system a classification scheme tries
to present is reflected when using SKOS.

To some degree, when order is connected to hierarchy, this can be
reflected by extensions to SKOS. The DDC for example has two parallel
hierarchies, one expressed by length of notation, the other by structure
(notes, etc.). This is handled at the moment by extending skos:narrower.

skosclass:narrowerStructural rdfs:subPropertyOf skos:narrower .

skosclass:broaderStructural rdfs:subPropertyOf skos:broader ;
  owl:inverseOf skosclass:narrowerStructural .

[1] http://lists.w3.org/Archives/Public/public-swd-wg/2008Oct/0061.html
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