Sparql endpoint

Sparql endpoint

The **sparql endpoint** for the RDF dataset of OpenResearch is in 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

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"

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

Query 3, get pc members and general chairs who involve semantic web related events in last 7 years

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