query-9f8d67a2a0a83272151980379c20aab4
The query takes 40 to 50 seconds to run which seems far too much to find a single item. With this little rewrite with a string constant instead of ?title_sv:
Use at
- https://query.wikidata.org/sparql
PREFIX schema: <http://schema.org/>
SELECT ?article_sv ?item
WHERE 
{
  ?article_sv schema:name "Helsingfors"@sv.
  ?article_sv schema:isPartOf <https://sv.wikipedia.org/>.
  ?article_sv schema:about ?item.
}
Query found at
graph TD
classDef projected fill:lightgreen;
classDef literal fill:orange;
classDef iri fill:yellow;
  v1("?article_sv"):::projected 
  v2("?item"):::projected 
  c2([sHelsingfors^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#langString>"]):::literal 
  c4([https://sv.wikipedia.org/]):::iri 
  v1 --"schema:name"-->  c2
  v1 --"schema:isPartOf"-->  c4
  v1 --"schema:about"-->  v2