- From: Martin Hepp \(DERI extern\) <martin.hepp@deri.org>
- Date: Wed, 12 Oct 2005 20:16:14 +0200
- To: "'Gong Cheng'" <gcheng@seu.edu.cn>, <semantic-web@w3c.org>
- Cc: <semanticweb@yahoogroups.com>
Dear Gong: Object Properties in OWL Lite and DL can, to my knowledge, only be used between instances, not between classes. This is why you usually do not find them as a means to express relationships between classes (since most ontology creators do not want their ontology to become OWL Full, for lack of reasoner support). Only Annotation Properties in OWL are not limited in this way, but they have no formal semantics. You can find a bit more background information in [1]. So the lack of such relationships is mainly caused by characteristics of OWL as an ontology language. Other ontology languages, like WSML, do not have this limitation. Martin [1] M. Hepp: "Representing the Hierarchy of Industrial Taxonomies in OWL: The gen/tax Approach", Proceedings of the ISWC Workshop Semantic Web Case Studies and Best Practices for eBusiness (SWCASE05), November 7, Galway, Irland (forthcoming). Available at http://www.heppnetz.de/files/SWCASE05-gentax-short-camera-ready-new.pdf --------------------------- martin.hepp@deri.org, phone: +43 512 507 6465 http://www.heppnetz.de / http://www.deri.org -----Original Message----- From: semantic-web-request@w3.org [mailto:semantic-web-request@w3.org] On Behalf Of Gong Cheng Sent: Mittwoch, 12. Oktober 2005 16:58 To: semantic-web@w3c.org Cc: semanticweb@yahoogroups.com Subject: Sorry for misunderstanding my problem Hi all, I'm sorry I failed to express my problem. I mean that in most ontologies I have read, only subClassOf-hierarchy can be found. So it seems missing lots of other relationships(I mean instances of ObjectProperty) between concepts in the model rather than in the real world. Maybe the authors and users do not need those relationships in their views. But it does make the model not enough perfect... I don't know whether it is better to involve almost all the relationships in the specific domain, or just necessary. I hope my poor English never bother you again... Regards, Gong Cheng
Received on Wednesday, 12 October 2005 18:17:49 UTC