- From: Michael Schneider <schneid@fzi.de>
- Date: Sun, 15 Jul 2012 00:34:47 +0200
- To: Alan Ruttenberg <alanruttenberg@gmail.com>
- CC: Pat Hayes <phayes@ihmc.us>, David Booth <david@dbooth.org>, "semantic-web@w3.org" <semantic-web@w3.org>, OWL Working Group <public-owl-wg@w3.org>
Hi Alan! Am 14.07.2012 23:45, schrieb Alan Ruttenberg: > Rather it appears that this gives sanction to *rewriting* graphs > to be different graphs (spec saya "tranformed") and my concern is that > this rewriting process will destroy OWL serializations. Yes, if blank nodes are replaced by URIs, then this will destroy many OWL DL ontologies (in RDF graph form). All class expressions, complex data ranges, a few axioms (n-ary disjointness axioms and negative property assertions), and certain forms of annotations are written with a blank node that "glues together" the different triples that encode the language construct. In a few cases (intersection, union and enumeration), it is, for backward compatibility reasons, also allowed to use a URI, but in all other cases (e.g. for property restriction expressions), it is not. Further, the argument lists of all multi-argument language constructs, such as class intersection or n-ary disjointness axioms, are constructed from several blank nodes. So there are a lot of options for an OWL DL ontology to be hurt by a replacement of blank nodes by URIs. Probably, it wouldn't be a big thing for OWL DL tools to internally "repair" such ontologies, that is, to allow for URIs where blank nodes would be expected, but such ontologies would still count as formally invalid OWL DL ontologies. Cheers, Michael -- ......................................................... Dipl.-Inform. Michael Schneider Research Scientist, IPE / WIM FZI Forschungszentrum Informatik Haid-und-Neu-Str. 10–14 76131 Karlsruhe, Germany Tel.: +49 721 9654-726 Fax: +49 721 9654-727 michael.schneider@fzi.de www.fzi.de ......................................................... Forschungszentrum Informatik (FZI) an der Universität Karlsruhe Stiftung des bürgerlichen Rechts Stiftung Az: 14-0563.1 Regierungspräsidium Karlsruhe Vorstand: Dipl. Wi.-Ing. Michael Flor, Prof. Dr. Ralf Reussner, Prof. Dr. Rudi Studer, Prof. Dr.-Ing. J. Marius Zöllner Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus .........................................................
Received on Saturday, 14 July 2012 22:35:13 UTC