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Re: Species Concept Mapping RDF fixes and question, should the species be represented as a class? Class SpeciesConcept => Class Species Cougar

From: Bob Morris <morris.bob@gmail.com>
Date: Fri, 4 Dec 2009 13:50:21 -0500
Message-ID: <16957b040912041050h2f90239et59132a35132e3621@mail.gmail.com>
To: Pat Hayes <phayes@ihmc.us>
Cc: Peter DeVries <pete.devries@gmail.com>, public-lod@w3.org, dmozzherin@gmail.com
On Fri, Dec 4, 2009 at 1:02 PM, Pat Hayes <phayes@ihmc.us> wrote:
> On Dec 4, 2009, at 11:14 AM, Bob Morris wrote:
>>> In any civilized ontology language, a class is an instance. Use OWL 2
>>> from
>>> now on.
>>> Pat
>> Ah, a nice idea, but I doubt it will accomplish what Pete is trying to
>> do (Or my limited understanding of OWL 2 is wrong---which is a good
>> hypothesis).
>> http://www.w3.org/TR/2009/REC-owl2-syntax-20091027/#Metamodeling
>> says that when a  resource is mentioned as both an individual and a
>> class, the two mentions are interpreted independently.
> Well, true, so its not perfect. But it is better than OWL 1 in this regard.

Amen.  In fact, my first impression of OWL 2 is that one might think
of it as an answer to the question:  How can we robustly relax the
restriction in OWL1 that we made too cavalierly and that interfere
with important use cases. As I recall, the W3 docs even say that

One concern I am still trying to wrap my head around in biodiversity
applications---and maybe in lots of distributed science data
applications---is whether both the RL and QL profiles are needed in
the same ontology and in ways that their intersection is
insufficiently expressive. That's not for the question at hand though
(I think).

As to the perennial  class vs instances question, I'd be interested to
learn what kinds of scalability experiments have been done on the OWL2
EL profile (e.g. how many triples per class description in realistic
cases.) Per another posting, a comprehensive taxonomic ontology
probably requires at least three times, and more likely 10-20 times,
more classes than the 357K classes reported for SNOMED CT in
http://dx.doi.org/10.1016/j.artmed.2006.12.003.  The number of
distinct names is probably in similar ratio, as there are about 11
million names in the uBio NameBank http://www.ubio.org/ and about 1M

Robert A. Morris
Professor of Computer Science (nominally retired)
100 Morrissey Blvd
Boston, MA 02125-3390
Associate, Harvard University Herbaria
email: ram@cs.umb.edu
web: http://bdei.cs.umb.edu/
web: http://etaxonomy.org/FilteredPush
phone (+1)617 287 6466
Received on Friday, 4 December 2009 18:50:57 UTC

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