- From: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>
- Date: Tue, 4 Aug 2009 22:48:15 +0100
- To: Christine Golbreich <cgolbrei@gmail.com>
- Cc: Antoine Zimmermann <antoine.zimmermann@deri.org>, W3C OWL Working Group <public-owl-wg@w3.org>
Can we have a diff please. Thanks, Ian On 4 Aug 2009, at 18:58, Christine Golbreich wrote: > Note on asymmetric properties and profiles added in NF&R > > cg > 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/ >> >> > > > > -- > Christine >
Received on Tuesday, 4 August 2009 21:49:01 UTC