问题
I am using python to run some sparql queries. I want to extract information from http://factforge.net/sparql
sparql = SPARQLWrapper("http://factforge.net/sparql")
query = """
# F02: Big Cities in Eastern Europe
PREFIX onto: <http://www.ontotext.com/>
PREFIX gn: <http://www.geonames.org/ontology#>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT * FROM onto:disable-sameAs
WHERE {
SERVICE <http://factforge.net/sparql>{
?loc gn:parentFeature dbr:Eastern_Europe ;
gn:featureClass gn:P;
gn:featureCode gn:A.ADM2.
?loc dbo:populationTotal ?population ; dbo:country ?country .
?country a dbo:Country .
}
FILTER(?population > 300000 )
?country skos:prefLabel ?country_name .
} ORDER BY ?country_name DESC(?population)
"""
sparql.setQuery(query)
sparql.setReturnFormat(JSON)
results = sparql.query().convert()
This query works on the factforge website but locally I receive the following error EndPointNotFound: it was impossible to connect with the endpoint in that address, check if it is correct.
回答1:
GraphDB exposes RDF4J-style API. This is exactly what is said on the Help page.
The SPARQL endpoint address should be http://factforge.net/repositories/{repositoryID}.
Unfortunately, it is impossible to determine which repository is used from SPARQL in GraphDB.
You could use F12 Developer Tools in your browser for this purpose. Or the About page says:
Applications can access FactForge via SPARQL at http://factforge.net/repositories/ff-news.
This is also the service address to be used for federated SPARQL queries.
来源：https://stackoverflow.com/questions/47454145/sparql-unable-to-use-factforge-endpoint