Exploiting the LOD Cloud Knowledge Graph using SPARQL-FED

danielhm · February 18, 2020, 7:31pm

Here is a simple example of using a Federated SPARQL Query (aka. SPARQL-FED) to generate a rich index of information sources from the LOD Cloud Knowledge Graph about a recent participant in the Australian Open Event.
By joining Wikidata and DBpedia data a richer Knowledge Graph is generated and deployed as an HTML document.

PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wdtn: <http://www.wikidata.org/prop/direct-normalized/>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dct: <http://purl.org/dc/terms/>

SELECT DISTINCT
      ?person 
      ?dbpediaURI 
      # ?dateOfBirth
      # ?countryName
      ?subject
      ?subjectLabel
WHERE
    {
        SERVICE <https://query.wikidata.org/sparql>
            {
                SELECT *
                WHERE 
                    { 
                        ?person wdt:P106 wd:Q10833314 ;
                                    rdfs:label 'Nick Kyrgios'@en ;
                                    wdt:P569 ?dateOfBirth ;
                                    wdt:P27 [ rdfs:label ?countryName ] .
                        filter(lang(?countryName) = "en")
                    }
            }

    SERVICE <http://dbpedia.org/sparql>
            {
                SELECT *
                WHERE 
                    { 
                        ?dbpediaURI owl:sameAs ?person;
                        dct:subject ?subject.
                        ?subject rdfs:label ?subjectLabel
                    }
            }
        
    }

Live Query Result Link

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