[Nepomuk] properties range and RDF literals

[Sebastian Trüg]

Throughout Nepomuk only typed literals are used. The only exception are
the ontologies, i.e. rdfs:label and rdfs:comment on classes and properties.

Cheers,
Sebastian

On 04/20/2010 09:51 PM, Evstifeev Roman wrote:
> 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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>>
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