- From: Michael Schneider <schneid@fzi.de>
- Date: Fri, 21 Sep 2007 18:34:41 +0200
- To: "Andrea Splendiani" <andrea.splendiani@univ-rennes1.fr>
- Cc: "David Price" <david.price@eurostep.com>, "semantic-web" <semantic-web@w3.org>
Hi, Andrea! Andrea Splendiani wrote on Friday, September 21: >Hi, so maybe I'm having a major lack of knowledge here, aren't >classes in the ontology supposed to be identified with a fragment ? You mean hash URIs with a "#" of the form ONTOLOGYURI#CLASSNAME ? No, not necessarily. The URIs of the classes (and properties, and individuals) in an OWL ontology can even be completely unrelated to the URI of the ontology. This may sound strange, but see it this way: If you import one ontology O1 into another ontology O2, then all the axioms of O1 are considered to be axioms of O2. Especially, all the classes of O1 are then classes of O2. And O1 and O2 will probably have very different URIs, and so there will be classes within O2 (those coming from O1), which are not simply "string extensions" of O2's URI. And, of course, URIs of OWL classes do not need to be hash-URIs. They just need to be URIs. :) Cheers, Michael -- Dipl.-Inform. Michael Schneider FZI Forschungszentrum Informatik Karlsruhe Abtl. Information Process Engineering (IPE) Tel : +49-721-9654-726 Fax : +49-721-9654-727 Email: Michael.Schneider@fzi.de Web : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555 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 Regierungspräsidium Karlsruhe Vorstand: Rüdiger Dillmann, Michael Flor, Jivka Ovtcharova, Rudi Studer Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus
Received on Friday, 21 September 2007 16:34:52 UTC