- From: Rinke Hoekstra <hoekstra@uva.nl>
- Date: Fri, 30 May 2008 10:38:38 +0200
- To: mak@aifb.uni-karlsruhe.de
- Cc: Carsten Lutz <clu@tcs.inf.tu-dresden.de>, Michael Schneider <schneid@fzi.de>, public-owl-wg@w3.org
Tracker, this is also related to ISSUE-112 -Rinke On 30 apr 2008, at 16:53, Markus Krötzsch wrote: > On Mittwoch, 30. April 2008, Markus Krötzsch wrote: >> On Freitag, 25. April 2008, Carsten Lutz wrote: >>> On Thu, 24 Apr 2008, Michael Schneider wrote: >>>> Hi! >>>> >>>> I have a question regarding the topProperty and the >>>> bottomProperty. If >>>> these properties are going to be introduced into OWL 2, would >>>> they only >>>> go into OWL-DL/Full, or can they also be included into each of the >>>> profiles? Do these properties add to the semantic expressivity or >>>> to >>>> the computational complexity of the profiles? >>> >>> For the case of EL++: the top and bottom properties can be >>> included. They >>> do add to the expressivity, but do not increase computational >>> complexity. >>> The latter is very easy to see by looking at existing EL++ >>> algorithms, >>> and I think it also follows from Markus' rule-extension of EL++. >> >> Yes, and this is still the case if you add things like role >> disjointness >> and local reflexivity. If you add only universal properties, it is >> indeed >> very easy to modify the existing algorithms. >> >> Anything above OWL DL can easily axiomatise a top property (using DL >> pseudo-notation here, sorry): >> >> TOP SUBCLASSOF EXISTS R1.{a} >> TOP SUBCLASSOF EXISTS R2.{a} >> R1 o R2 SUBPROPOF U > Typo. It should of course be: > > R1 o R2- SUBPROPOF U > > R1, R2 (properties) and a (individual) are of course new names, not > used > anywhere else. > > -- Markus > >> >> Then U is the universal. In other words: when you have defined your >> semantics for TOP (thing), you also can define an according "cross >> product" >> TOP x TOP easily. BottomProperties are even easier (see previous >> telco >> logs). >> >> Cheers, >> >> Markus >> >>> greetings, >>> Carsten >>> >>> -- >>> * Carsten Lutz, Institut f"ur Theoretische Informatik, TU >>> Dresden >>> * * Office phone:++49 351 46339171 >>> mailto:lutz@tcs.inf.tu-dresden.de * > > > > -- > Markus Krötzsch > Institut AIFB, Universität Karlsruhe (TH), 76128 Karlsruhe > phone +49 (0)721 608 7362 fax +49 (0)721 608 5998 > mak@aifb.uni-karlsruhe.de www http://korrekt.org ----------------------------------------------- Drs. Rinke Hoekstra Email: hoekstra@uva.nl Skype: rinkehoekstra Phone: +31-20-5253499 Fax: +31-20-5253495 Web: http://www.leibnizcenter.org/users/rinke Leibniz Center for Law, Faculty of Law University of Amsterdam, PO Box 1030 1000 BA Amsterdam, The Netherlands -----------------------------------------------
Received on Friday, 30 May 2008 08:39:14 UTC