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Re: asymmetric VS non-symmetric

From: Christine Golbreich <cgolbrei@gmail.com>
Date: Tue, 4 Aug 2009 19:58:13 +0200
Message-ID: <b0ed1d660908041058i66307f77x5485f29f8bb2e066@mail.gmail.com>
To: Antoine Zimmermann <antoine.zimmermann@deri.org>
Cc: W3C OWL Working Group <public-owl-wg@w3.org>
Note on asymmetric properties and profiles added in NF&R

2009/7/31 Antoine Zimmermann <antoine.zimmermann@deri.org>:
> Dear all,
> Until today, I did not look at the semantics of AsymmetricProperty because
> the word was familiar enough to me to intuitively understand it. I was
> however wrongly assuming that the word was used to denote non-symmetric.
> From a linguistic perspective, asymmetry is a lack or absence of symmetry.
> Some mathematical texts use "asymmetric" to simply mean "not symmetric".
> I am aware that "asymmetric relation" is often used in mathematics to denote
> "strongly asymmetric relation", i.e., no pairs of elements are related in a
> bidirectional (symmetric) way. While it is perfectly ok that OWL2 defines
> AsymmetricProperties the way it does, I am surprised not to find *any*
> remark, neither in the formal specs, nor in the UFDs, nor in the mailing
> list archives, about the fact that AsymmetricProperty is not the complement
> of SymmetricProperty.
> I am sure that other people are understanding asymmetry in the same way as I
> did, so I'd suggest adding a small sentence in the Primer (Sect.6.1 [1]) and
> NF&R (Sect.2.2.3 [2]) stating that "asymmetric" is not the negation of
> "symmetric". Since the UFDs are still in LC, this should be addressed
> somehow.
> [1]
> http://www.w3.org/TR/2009/WD-owl2-primer-20090421/#Property_Characteristics
> [2]
> http://www.w3.org/TR/2009/WD-owl2-new-features-20090421/#F6:_Reflexive.2C_Irreflexive.2C_and_Asymmetric_Object_Properties
> Regards,
> --
> Antoine Zimmermann
> Post-doctoral researcher at:
> Digital Enterprise Research Institute
> National University of Ireland, Galway
> IDA Business Park
> Lower Dangan
> Galway, Ireland
> antoine.zimmermann@deri.org
> http://vmgal34.deri.ie/~antzim/

Received on Tuesday, 4 August 2009 17:58:54 UTC

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