Difference between revisions of "Sparql endpoint"
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| − | ==== Sparql endpoint The SPARQL endpoint for the RDF dataset of OpenResearch is accessable here ==> [http://openresearch.org/sparql sparql] | + | ==== Sparql endpoint The SPARQL endpoint for the RDF dataset of OpenResearch is accessable here ==> [http://openresearch.org/sparql sparql]==== |
==== The following contains some sparql query examples ==== | ==== The following contains some sparql query examples ==== | ||
Revision as of 16:39, 19 December 2016
Contents
- 1 Sparql endpoint The SPARQL endpoint for the RDF dataset of OpenResearch is accessable here ==> sparql
- 2 The following contains some sparql query examples
- 2.1 Query 1, find events which have country location, city location, start date, end date, and home page
- 2.2 Query 2, get events happen in Europe between 2016-01-01 and 2017-01-01, with acceptance rate less than 25%, with related to "semantic web"
- 2.3 Query 3, get pc members and general chairs who involve semantic web related events in last 7 years
- 2.4 Query 4, Which period of year have had the most number of events organized for a specific field or topic
Sparql endpoint The SPARQL endpoint for the RDF dataset of OpenResearch is accessable here ==> sparql
The following contains some sparql query examples
Query 1, find events which have country location, city location, start date, end date, and home page
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#>
PREFIX property: <http://openresearch.org/Special:URIResolver/Property-3A>
PREFIX category: <http://openresearch.org/Special:URIResolver/Category-3A>
PREFIX wiki: <http://openresearch.org/Special:URIResolver/>
PREFIX icaltzd: <https://www.w3.org/2002/12/cal/icaltzd#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?event ?endDate ?startDate ?city ?country ?wikipage ?homepage WHERE {
?e property:Has_location_country category:Germany.
?e rdfs:label ?event.
?e property:Has_location_city ?city.
?e property:Has_location_country ?country.
?e icaltzd:dtend ?endDate.
?e icaltzd:dtstart ?startDate.
?e foaf:homepage ?homepage.
?e swivt:page ?wikipage.
} ORDER BY DESC(?startDate) LIMIT 100
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#>
PREFIX property: <http://openresearch.org/Special:URIResolver/Property-3A>
PREFIX category: <http://openresearch.org/Special:URIResolver/Category-3A>
PREFIX wiki: <http://openresearch.org/Special:URIResolver/>
PREFIX site: <http://openresearch.org/Special:ExportRDF/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX icaltzd: <https://www.w3.org/2002/12/cal/icaltzd#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?event ?endDate ?startDate ?city ?country ?wikipage ?acceptanceRate ?continent WHERE {
?e rdfs:label ?event.
?e property:Has_location_country ?country.
?country rdfs:subClassOf ?partContinent.
?partContinent rdfs:subClassOf ?continent.
?continent rdfs:isDefinedBy site:Category:Europe.
?e a category:Semantic_Web.
?e icaltzd:dtstart ?startDate.
?e icaltzd:dtend ?endDate.
?e property:Acceptance_rate ?acceptanceRate.
?e property:Has_location_city ?city.
?e swivt:page ?wikipage.
FILTER (?acceptanceRate < 25.0 && ?startDate >= "2016-01-01"^^xsd:date && ?endDate < "2017-01-01"^^xsd:date).
} ORDER BY DESC(?startDate) LIMIT 100
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#>
PREFIX urir: <http://openresearch.org/Special:URIResolver/>
PREFIX property: <http://openresearch.org/Special:URIResolver/Property-3A>
PREFIX category: <http://openresearch.org/Special:URIResolver/Category-3A>
PREFIX wiki: <http://openresearch.org/Special:URIResolver/>
PREFIX site: <http://openresearch.org/Special:ExportRDF/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX icaltzd: <https://www.w3.org/2002/12/cal/icaltzd#>
SELECT ?event ?endDate ?startDate ?pcMember ?geMember WHERE {
?e rdfs:label ?event.
?e property:Has_PC_member ?pcMember.
?e property:Has_general_chair ?geMember.
?e a category:Semantic_Web.
?e icaltzd:dtstart ?startDate.
?e icaltzd:dtend ?endDate.
minus {?e property:Has_PC_member urir:Some_person.}
FILTER (?startDate >= "2010-01-01"^^xsd:date && ?endDate < "2017-01-01"^^xsd:date).
} ORDER BY DESC(?startDate) LIMIT 10
Query 4, Which period of year have had the most number of events organized for a specific field or topic
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX property: <http://openresearch.org/Special:URIResolver/Property-3A>
PREFIX category: <http://openresearch.org/Special:URIResolver/Category-3A>
PREFIX icaltzd: <https://www.w3.org/2002/12/cal/icaltzd#>
SELECT ?month (count(?e) as ?numEvents) WHERE
{
?e rdfs:label ?event.
?e icaltzd:dtend ?endDate.
?e icaltzd:dtstart ?startDate.
?e a category:Semantic_Web.
Filter (datatype(?endDate) != xsd:double && datatype(?startDate) != xsd:double)
FILTER (?startDate >= "2016-01-01"^^xsd:date && ?endDate < "2017-01-01"^^xsd:date).
VALUES ?month {1 2 3 4 5 6 7 8 9 10 11 12}
FILTER ( month(?startDate) <= ?month && ?month <= month(?endDate) )
} GROUP BY ?month
