On 03/24/2017 05:47 PM, Stas Malyshev wrote:
> Hi!
>
>> I'm trying to figure out whether the Wikidata label service (the stuff that
>> is
>> invoked as
>> SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }
>> in queries to the Wikidata query service) is something that can be done in
>> SPARQL or whether it is an extension that can't be done in SPARQL. Does
>> anyone know the answer to this?
>
> Yes, you can do labels in SPARQL, just do:
>
> ?item rdfs:label ?itemLabel.
> FILTER(lang(?itemLabel) = 'en')
>
>> The reason that I ask is that it appears that the service accesses the names
>> of SPARQL variables in solution sets, and I can't think of how it does that
>> using SPARQL facilities.
>
> That part you probably can't do in SPARQL, I think - you have to name
> the variables explicitly.
That's what I thought, but SPARQL is such a complex beast that I wanted to get
an answer from someone who knows for sure.
peter
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