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Re: Value type constraints

From: Richard Cyganiak <richard@cyganiak.de>
Date: Fri, 27 Mar 2015 18:00:53 +0000
Cc: Irene Polikoff <irene@topquadrant.com>, Holger Knublauch <holger@topquadrant.com>, "public-data-shapes-wg@w3.org" <public-data-shapes-wg@w3.org>
Message-Id: <5B2A375E-CAC2-4C98-A9FC-9229A9F497EA@cyganiak.de>
To: Jose Emilio Labra Gayo <jelabra@gmail.com>
Jose,

I suggest adding this as a proposed requirement.

The xsd:string datatype doesn’t support language tags though. In “old” RDF, language-tagged literals were special and didn’t have a datatype at all. In RDF 1.1, they have the datatype rdf:langString [1]. So you’d have to say:

    sh:property [
        sh:predicate rdfs:label;
        sh:valueDatatype rdf:langString;
        sh:languageTag "es";
    ].

Or maybe the use of sh:languageTag could imply that value for sh:valueDatatype. Then you could just say:

    sh:property [
        sh:predicate rdfs:label;
        sh:languageTag "es";
    ].

This would work, as rdf:langString is the only datatype that supports language tags anyway [2].

Best,
Richard


[1] http://www.w3.org/TR/rdf11-concepts/#section-Datatypes
[2] http://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal


> On 27 Mar 2015, at 17:02, Jose Emilio Labra Gayo <jelabra@gmail.com> wrote:
> 
> 
> sh:literalType instead of sh:datatype - since it is about literal values
> 
> For me, both are ok.
> 
> I would also like to suggest a way to constraint the language tag. For example, I would like to express concepts that have rdfs:label.
> ex:shape a sh:Shape
>    sh:property [
>      sh:predicate rdfs:label ;
>      sh:valueDatatype xsd:string ;
> 
>      sh:languageTag "es" 
>    ] .
> 
> I have no preference for some specific name of that property, but I think there should be some way to constraint the language tag of a string literal.
> 
> Best regards, Jose Labra
> 
> 
> On 3/27/15, 7:30 AM, "Richard Cyganiak" <richard@cyganiak.de> wrote:
> 
> >Or maybe even:
> >
> >    sh:type - for constraining the value¹s rdf:type
> >    sh:datatype - for constraining the value¹s literal datatype
> 
> 
> 
> 
> 
> 
> -- 
> -- Jose Labra
> 
Received on Friday, 27 March 2015 18:01:23 UTC

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