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