- From: Jiří Procházka <ojirio@gmail.com>
- Date: Mon, 04 Jan 2010 14:58:07 +0100
- To: Dave Reynolds <dave.e.reynolds@googlemail.com>
- CC: Semantic Web <semantic-web@w3.org>
- Message-ID: <4B41F3EF.3030709@gmail.com>
Hmm I guess you are right (http://www.w3.org/TR/rdf-concepts/#section-Literal-Equality). I guess some property would have to be created: _:x rdf:type xsd:date . _:x todo:value "2008-01-01" . todo:value rdfs:domain rdfs:Literal . # well, typed literal, no such class exists (yet) todo:value rdfs:range rdfs:Literal . # well, plain literal :) that should be equivalent to saying: _:x owl:sameAs "2008-01-01"^^xsd:date . Best, Jiri On 01/04/2010 09:28 AM, Dave Reynolds wrote: > Jiří Procházka wrote: >> Sorry for resurrecting this old thread, but I just stumbled upon this: >> >> "rdfs:Datatype is both an instance of and a subclass of rdfs:Class. Each >> instance of rdfs:Datatype is a subclass of rdfs:Literal." >> >> "A typed literal is an instance of a datatype class." >> >> citing http://www.w3.org/TR/rdf-schema/#ch_datatype >> >> So I think this is valid: >> >> _:x rdf:type xsd:date . >> _:x owl:sameAs "2008-01-01" . > > Not as such, did you mean: > > _:x rdf:type xsd:date . > _:x owl:sameAs "2008-01-01"^^xsd:date . > > ? Which would, I believe, be valid. > > Dave > >> >> Quite confusing, but might be useful for RDF systems which treat >> literals as just one "type" (type from their point of view). >> >> Shame there is no such thing for language tags, or is there? >> >> Best, >> Jiri Prochazka >> >> On 07/06/2009 07:43 PM, Jeremy Carroll wrote: >>> Pat Hayes wrote: >>>>>> p a rdf:Property ; >>>>>> rdfs:domain rdfs:Literal ; >>>>>> rdfs:range rdfs:Datatype . >>>> >>>> _:x p xsd:date . >>>> _:x :seenAsLiteral "2008-01-01" . >>> I tend to write these examples as >>> >>> _:x p xsd:date . >>> _:x owl:sameAs "2008-01-01" . >>> >>> Semantically that has a literal as the subject, and it works around the >>> legacy syntactic restriction >>> >>> Unfortunately the reasoning required to make this work means that simple >>> RDF systems may well not get it. >>> >>> Jeremy >>> >>> >>> >> >
Received on Monday, 4 January 2010 13:58:45 UTC