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
