On Thu, Feb 3, 2011 at 4:46 PM, Antoine Isaac <aisaac@few.vu.nl> wrote: > Hi Jeff, > > As this coordination issue is complex indeed, this was not handled in SKOS. > Instead it relies on specific extensions to be designed--this is MADS/RDF > [1] is made for, in fact! > There are complexities in the syntax and semantics of subdivided, coordinated, compound, and faceted headings that aren't really addressed by the MADS/RDF proposal. I have a presentation covering some aspects of the semantics of subdivided and faceted headings at ISKO-UK conference in London this year. One thing to be careful of with prefLabel is that SKOS does not explicitly express the constraint that prefLabel's must be unique in a given scheme. This restriction is tricky to express, even with OWL 2 Key Properties, as prefLabels are annotation properties, and are thus not covered by the OWL 2 semantics. The constraint can be expressed for skosxl, as skosxl:prefLabel is an ObjectProperty, and literalForm is a DataProperty (though there's a little bit of trickiness needed to make sure that two Labels with the same literalForm aren't used as skosxl:prefLabel for different concepts). Also, if the same label is used for two concepts, HasKey will infer that they are owl:sameAs. Simon
Received on Friday, 4 February 2011 21:43:31 UTC