Implementing Service-Task SPARQL enrichment

[jetschni]

Example implementation in php

// Enhancing
$query = '
PREFIX schema: <http://schema.org/>
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX bise:  <http://akwi.de/ns/bise#>
PREFIX dbpedia-de: <http://de.dbpedia.org/resource/>
PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
INSERT {
    GRAPH <'.$url.'> {
        ?placeURI schema:url ?wikipediaURL;
            foaf:depiction ?depiction;
            bise:desc ?comment.
        ?universityURI a schema:CollegeOrUniversity.
    }
}
WHERE {
    {
		SELECT * WHERE {
			GRAPH <'.$url.'> {
				{
					SELECT * WHERE {
    					?universityURI  a schema:CollegeOrUniversity.
    					?placeURI  a schema:Place.
					}
					LIMIT 1
				}
			}
			SERVICE <http://de.dbpedia.org/sparql/> {
				?placeURI rdfs:comment ?comment_lang;
          			foaf:isPrimaryTopicOf ?wikipediaURL;
					foaf:depiction ?depiction.
					FILTER (LANG(?comment_lang) = "de")
					BIND (str(?comment_lang) AS ?comment)
    		}
		}
	}
}
';
$response = sparqlUpdate($query);

https://github.com/EduGraph/EduGraph-Preview/blob/dev-php-implementation/extract.php

and

function sparqlUpdate($query){
    $service = 'http://fbwsvcdev.fh-brandenburg.de:8080/fuseki/EduGraph-ESWC-extract/update';
    $client = new GuzzleHttp\Client(['base_uri' => $service]);
    try {
        $response = $client->request('POST', '', [
            'headers' => [
                'Content-Type' => 'application/x-www-form-urlencoded',
                'Accept' => 'application/sparql-results+json; charset=utf-8application/sparql-results+json; charset=utf-8'
            ],
            'body' => 'update='.$query
        ]);
        return $response;
    }
    catch(Exception $e) {
        $responseBody = $e->getResponse()->getBody(true);
        echo '<pre>';
        print_r ($e->getMessage());
        echo $responseBody;
        echo '</pre>';
    }
}

https://github.com/EduGraph/EduGraph-Preview/blob/dev-php-implementation/function.php

[jetschni]

Endpoint

http://fbwsvcdev.fh-brandenburg.de:8080/fuseki/EduGraph-ESWC-extract/update

Header:

• 'Content-Type' => 'application/x-www-form-urlencoded',
• 'Accept' => 'application/sparql-results+json; charset=utf-8application/sparql-results+json; charset=utf-8'

Body
update=$query