- From: Michael Schneider <schneid@fzi.de>
- Date: Sat, 24 Jul 2010 12:50:41 +0200
- To: "Antoine Zimmermann" <antoine.zimmermann@deri.org>
- Cc: <foaf-dev@lists.foaf-project.org>, "Semantic Web" <semantic-web@w3.org>, "Linked Data community" <public-lod@w3.org>
Hi! One note of caution! The FOAF-DL ontology is only (approximately) equivalent to the original version of FOAF in OWL /2/, since OWL keys have only been introduced as of OWL 2. Older existing systems that depend on the FOAF inverse-functional data properties (IFDPs) have to make sure that they can also work with the new OWL 2 keys, before switching to the FOAF-DL ontology. If such a system internally uses a reasoner that is able to work with IFDPs but does not know about OWL 2 keys (e.g. the current version of the Jena rule reasoner), then the system will not be able to make the expected inferences anymore, i.e. that two foaf:Person having the same mbox_sha1sum are the same person. So one will have to decide to either stay with the old FOAF ontology, or to replace the currently used reasoner. This is, of course, a general problem when trying to upgrade to a newer specification. But it should at least be stated explicitly, when publishing a variant of an ontology that is in wide use. Michael >-----Original Message----- >From: semantic-web-request@w3.org [mailto:semantic-web-request@w3.org] >On Behalf Of Antoine Zimmermann >Sent: Friday, July 16, 2010 1:17 PM >To: foaf-dev@lists.foaf-project.org; Semantic Web; Linked Data community >Subject: FOAF DL > >Dear all, > > >I know that the compatibility of FOAF with OWL DL has been discussed a >lot in the past (and still sometimes surfaces again). However, I'm >wondering, would it be reasonable to provide a DL version of FOAF in >complement of the official FOAF ontology? >More generally, wouldn't it be reasonable to provide alternative >versions of an ontology? Think of XHTML: there are three different XML >Schemas for XHTML [1]. One could imagine alternative versions like FOAF >(Full), FOAF-DL, FOAF-lite... > >Anyway, I did it: I've made a FOAF-DL ontology which modifies the FOAF >ontology such that (1) it is in OWL 2 DL and (2) it maximally preserves >inferences of the original FOAF ontology [2]. > >Interestingly, FOAF-DL is an OWL 2 RL ontology (in a nutshell, OWL 2 RL >is a subset of OWL 2 DL with low computational complexity and that is >compatible with rule-based inference engine). > >You may notice that there are strange annotation properties for this >ontology: > ><owl:Ontology rdf:about="http://purl.org/az/foaf#"> > ... > <yoda:preferredVersion rdf:resource="http://xmlns.com/foaf/0.1/"/> > ... ></owl:Ontology> > >The Yoda vocabulary [3] is used to relate alternative versions of an >ontology. Here, it is said that there is a preferred version, which is >the official FOAF ontology. > >Critiques to any of the previous comments are welcome. > > >[1] http://www.w3.org/TR/xhtml1-schema/#schemas >[2] The FOAF-DL ontology. http://purl.org/az/foaf >[3] Yoda: A Vocabulary for Linking Alternative Specifications of a >Vocabulary. http://purl.org/NET/yoda > > >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/ -- Dipl.-Inform. Michael Schneider Research Scientist, Information Process Engineering (IPE) Tel : +49-721-9654-726 Fax : +49-721-9654-727 Email: michael.schneider@fzi.de WWW : http://www.fzi.de/michael.schneider ======================================================================= FZI Forschungszentrum Informatik an der Universität Karlsruhe Haid-und-Neu-Str. 10-14, D-76131 Karlsruhe Tel.: +49-721-9654-0, Fax: +49-721-9654-959 Stiftung des bürgerlichen Rechts, Az 14-0563.1, RP Karlsruhe Vorstand: Prof. Dr.-Ing. Rüdiger Dillmann, Dipl. Wi.-Ing. Michael Flor, Prof. Dr. Dr. h.c. Wolffried Stucky, Prof. Dr. Rudi Studer Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus =======================================================================
Received on Saturday, 24 July 2010 10:51:22 UTC