Hi everybody,
I try to get some image links from wikidata by running a SPARQL-query
from my local Jena Fuseki instance. I want to merge it with data from my
local graph. Unfortunately the query isn't delivering any data but runs
and runs instead without any error message.
The sparql-query:
|PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX wd:
<http://www.wikidata.org/entity/> PREFIX wdt:
<http://www.wikidata.org/prop/direct/> PREFIX foaf:
<http://xmlns.com/foaf/0.1/> SELECT ?name ?image WHERE { ?s foaf:name
?name. ?s owl:sameAs ?wikidata_link. FILTER regex(str(?wikidata_link),
"wikidata"). SERVICE <https://query.wikidata.org/sparql> {
?wikidata_link wdt:P18 ?image. } } LIMIT 10 |
The test data I have in my local graph on the Jena Fuseki server:
|@base <http://dmt.de/pages> . @prefix rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs:
<http://www.w3.org/2000/01/rdf-schema#> . @prefix foaf:
<http://xmlns.com/foaf/0.1/> . @prefix dbp:
<http://dbpedia.org/resource/> . @prefix wd:
<https://www.wikidata.org/entity/> . @prefix owl:
<http://www.w3.org/2002/07/owl#> . <#john-cage> a foaf:Person ;
foaf:name "John Cage"; owl:sameAs dbp:John_Cage, wd:Q180727.
<#karlheinz-stockhausen> a foaf:Person ; foaf:name "Karlheinz
Stockhausen"; owl:sameAs dbp:Karlheinz_Stockhausen, wd:Q154556.
<#arnold-schoenberg> a foaf:Person; foaf:name "Arnold Schönberg";
owl:sameAs dbp:Arnold_Schoenberg, wd:Q154770. |
I tried a similar query for dbpedia-data which run perfectly.
|PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX dbp:
<http://dbpedia.org/resource/> PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbo: <http://dbpedia.org/ontology/> SELECT ?name ?dbpedia_link
?birthplace WHERE { ?s foaf:name ?name. ?s owl:sameAs ?dbpedia_link.
FILTER regex(str(?dbpedia_link),"dbpedia.org"). SERVICE
<https://dbpedia.org/sparql> { ?dbpedia_link dbo:birthPlace ?birthplace.
} } LIMIT 10 |
Any Ideas? Thanks in advance!
Jan Seipel
PS: also got this question on stackoverflow:
https://stackoverflow.com/questions/59937684/sparql-query-to-get-data-from-wikidata-not-working
