[Nepomuk] properties range and RDF literals

[Evstifeev Roman]

On Tuesday 20 of April 2010 18:38:27 Sebastian Trüg wrote:
> I agree with you. I actually think that there is not a single property
> in the Nepomuk ontologies that could not have a typed literal range
> (well, except for the ones that have non-literal ranges of course).
> But changing that now could break backwards compatibility without any
> real gain. At least I cannot think of any practical advantage to fixing
> the ranges.
> 
Ok. There is another question.
Dolphin can assign nao:description to file. It uses typed RDF literal of type 
xsd:string as a value. (and it is ok, as range is any rdfs:Literal)
But let's look at rdfs:comment, the superproperty of nao:description. It has a 
rdfs:Literal range too. 
In ontology graphs _plain_ RDF literals are used as values of rdfs:comment 
property. (for ex. <nao:Party> <rdfs:comment> "Represents a single or a group 
of individuals")
So the question is what is preferable type for values of those properties (and 
all the other properties with range of rdfs:Literal) - plain RDF literal, or 
typed with xsd:string type?

> Cheers,
> Sebastian
> 
> On 04/20/2010 04:20 PM, Evstifeev Roman wrote:
> > Looking at those two properties:
> > 1) nfo:fileName
> > 
> >       rdfs:range <http://www.w3.org/2001/XMLSchema#string>
> > 
> > 2) nao:description
> > 
> >       rdfs:range <http://www.w3.org/2000/01/rdf-schema#Literal>
> > 
> > am i right, that:
> > nfo:fileName here have range of typed RDF literal of type xsd:string
> > nao:description have range of some RDF literal (typed or plain)
> > 
> > and second:
> > why range of those properties are different? It seems to me, that
> > nao:description only will ever contain a string too, and range of any RDF
> > lieral is useless here. (for ex. using xsd:integer as a description is
> > weird) _______________________________________________
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> > Nepomuk at kde.org
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> 
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