I wanted to access dbt:Cricket_by_country(value) inside of the dbp:wikiPageUsesTemplates (Property), but I am not able to access it. I am very new to the SPARQL
Below is my code
PREFIX cia: <http://www.semanticweb.org/neelc/ontologies/countries#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX dct: <http://purl.org/dc/terms/>
PREFIX dbpedia-populated-place: <http://dbpedia.org/ontology/PopulatedPlace/>
PREFIX dbcat:<http://dbpedia.org/resource/Category>
select distinct ?name , ?sizeOfTeam, ?equipment, ?TeamCountry, ?Country
where
{
?cricket dct:subject <http://dbpedia.org/resource/Category:Cricket>.
?cricket dbp:name ?name.
?cricket dbo:teamSize ?sizeOfTeam.
?cricket dbo:equipment ?equipment.
?cricket dbp:wikiPageUsesTemplate ?TeamCountry .
?cricket dbp:TeamCountry.dbt:Cricket_by_country ?Country
FILTER (LANG(?name)="en")
FILTER regex(str(?cricket), "/resource/Cricket")
}
Related
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!
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX db: <http://dbpedia.org/ontology/>
PREFIX prop: <http://dbpedia.org/property/>
SELECT ?releaseDate
WHERE {
?film rdf:type db:Film;
foaf:name ?title.
?film dbp:releaseDate ?releaseDate.
FILTER regex(?releaseDate, "2016", "i").
}
Getting the release date but only two i am not sure about querying . since i am new to this.
I've used the following code to list the band members of Punk Rock bands:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema>
SELECT distinct ?bandname ?bandmembername where {
?band
foaf:name ?bandname;
dbo:genre dbr:Punk_Rock.
?bandmember
dbo:bandMember ?bandmember;
rdfs:label ?bandmembername.
}
I would need the band members of any Punk_Rock band.
There is no syntax error.
There are 2 errors in your query.
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema> should be PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
The dbo:bandMember ?bandmember predicate and object should be describing the ?band (which has members), not describing ?bandmember (which is the member)
With those fixes in the query, you should see the results you're hoping for --
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?bandname ?bandmembername
WHERE
{
?band
foaf:name ?bandname ;
dbo:bandMember ?bandmember ;
dbo:genre dbr:Punk_Rock .
?bandmember
rdfs:label ?bandmembername .
}
I'm trying to extract some data from dbpedia using SERVICE function of SPARQL.
In fact I want to extract the names, the lat and lot of all New York theaters. To check if an instance is a theater I can use http://dbpedia.org/class/yago/Theater104417809. One example of a theater could be http://dbpedia.org/resource/Grand_Theatre_(New_York_City).
How to use service function for getting what I need in SPARQL?
** EDIT **
The query that I'm trying is the following one, but is not returning any value.
PREFIX dbpedia: <http://dbpedia.org/ontology/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX geos: <http://www.opengis.net/ont/geosparql#>
PREFIX geof: <http://www.opengis.net/def/function/geosparql/>
PREFIX : <http://www.semanticweb.org/frubi/ontologies/2017/10/puntsWIFI#>
SELECT *
WHERE {
SERVICE <http://dbpedia.org/sparql/> {
SELECT ?teatreName ?lat ?long
WHERE {
?teatre rdf:type dbpedia:Theatre .
?teatre foaf:name ?teatreName .
?teatre geo:lat ?lat .
?teatre geo:long ?long .
?teatre dbp:city ?ciutat .
?ciutat rdfs:label "New York City"#en
}
}
}
It's not an issue with federated querying, but with your DBpedia query. dbp:city is not an object property but simply of type rdf:Property, thus it's untyped. In your case, it maps to literals which means, you have to use the literal directly. The weird thing here is, that for some reasons you have to use the datatype http://www.w3.org/1999/02/22-rdf-syntax-ns#langString explicitly instead of "New York City"#en - that's clearly not intuitive for any user. Not sure whether this happened due to the DBpedia extraction or is the expected behaviour of Virtuoso.
PREFIX dbpedia: <http://dbpedia.org/ontology/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX geos: <http://www.opengis.net/ont/geosparql#>
PREFIX geof: <http://www.opengis.net/def/function/geosparql/>
PREFIX : <http://www.semanticweb.org/frubi/ontologies/2017/10/puntsWIFI#>
SELECT *
WHERE {
SERVICE <http://dbpedia.org/sparql/> {
SELECT ?teatreName ?lat ?long
WHERE {
?teatre rdf:type dbpedia:Theatre .
?teatre foaf:name ?teatreName .
?teatre geo:lat ?lat .
?teatre geo:long ?long .
?teatre dbp:city "New York City"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#langString>
}
}
}
I'm querying DBpedia types in SPARQL (http://dbpedia.org/sparql) by resource's label
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX : <http://dbpedia.org/resource/>
PREFIX ru: <http://ru.dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX dbo: <http://dbpedia.org/ontology/>
SELECT ?type ?superType WHERE { {
?res rdfs:label "HarryPotter"#en.
} UNION {
?redir dbo:wikiPageRedirects ?res .
?redir rdfs:label "HarryPotter"#en .
}
?res rdf:type ?type .
OPTIONAL {
?type rdfs:subClassOf ?superType .
}
}
It works fine.
But what if I know the exact resource - http://dbpedia.org/page/Harry_Potter? I tried something like:
?res a :Harry_Potter.
But it does not work.
How to query DBpedia types and supertypes if I know the resource URI? I can't figure out which property or operator I should use (e.g., rdfs:Resource, a, etc., which do not work)
When you write
?res a :Harry_Potter.
It doesn't work, because this means "a resource, which is of type :Harry_Potter". It is equivalent to
?res rdf:type :Harry_Potter.
:Harry_Potter identifies a resource and not the type, thus it should be used in place of ?res.
Also I think you mean Harry_Potter_(character), because that is the actual identifier and not redirect.
You query would be as simple as
SELECT ?type ?superType WHERE
{
# give me ?type of the resource
<http://dbpedia.org/resource/Harry_Potter_(character)> rdf:type ?type .
# give me ?superTypes of ?type
OPTIONAL {
?type rdfs:subClassOf ?superType .
}
}
You can just put the URI as the subject in there WHERE conditions.
SELECT ?title, ?releaseDate
WHERE {
<http://dbpedia.org/resource/Super_Mario_Bros._3> dbp:title ?title .
<http://dbpedia.org/resource/Super_Mario_Bros._3> dbo:releaseDate ?releaseDate .
}