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SPARQL Overview
From Decision XG
SPARQL Overview
SPARQL: SPARQL is a World Wide Web Consortium (W3C) recommendation for querying Resource Description Framework (RDF) data stores.
- You will find a SPARQL tutorial here: http://www.cambridgesemantics.com/2008/09/sparql-by-example/ (click or use right arrow key to step through).
- To explore SPARQL, you can run sample queries against dbpedia (an rdf data store collected from Wikipedia infoboxes) at http://dbpedia.org/snorql/.
- In case you are curious, a sample SPARQL query is below. This query doesn’t specify a data store, but you can copy/paste and run it against dbpedia.
The query asks for the names and populations of all landlocked countries whose population is greater than 15 million.
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX type: <http://dbpedia.org/class/yago/> PREFIX prop: <http://dbpedia.org/property/> SELECT ?country_name ?population WHERE { ?country a type:LandlockedCountries ; rdfs:label ?country_name ; prop:populationEstimate ?population . FILTER (?population > 15000000) . }