- From: Bernhard Schandl <bernhard.schandl@univie.ac.at>
- Date: Sat, 27 Jun 2009 10:00:50 +0200
- To: Dan Brickley <danbri@danbri.org>
- Cc: Tim rdf <timrdf@gmail.com>, Simon Reinhardt <simon.reinhardt@koeln.de>, public-lod@w3.org, public-semweb-ui@w3.org
Tim, (sorry, somehow your message didn't make it to me ...) > On 26/6/09 18:22, Tim rdf wrote: >> [1] http://www.ifs.univie.ac.at/schandl/2009/06/domain+range_bad.png >> >> is indicating that >> >> foaf:holdsAccount rdfs:domain foaf:Agent; rdfs:range >> foaf:OnlineAccount . >> >> Is constraining a property with BOTH a domain and range a good design >> pattern? It seems rather short-sighted with respect to reuse and >> extension. Domain and range are no restrictions in that sense; rather they extend the possible (!) interpretations of resources. Hence you don't say, "you can use foaf:holdsAccount only with foaf:Agent and foaf:OnlineAccount", but rather, "if something has a foaf:holdsAccount property then you can interpret it as foaf:Agent, and the value of this property can be interpreted as foaf:OnlineAccount". IMO this is one of the greatest strengths of modelling with RDF(S) and OWL. Best, Bernhard
Received on Saturday, 27 June 2009 08:01:33 UTC