function retrieveData() {
  var query = "PREFIX : <http://dbpedia.org/resource/> PREFIX dbp: <http://dbpedia.org/ontology/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX dbpprop: <http://dbpedia.org/property/> SELECT ?person ?b_date ?d_date ?abstract ?thumbnail WHERE { ?person rdf:type dbp:Person ; dbp:birthDate ?b_date ; dbp:deathDate ?d_date ; dbp:abstract ?abstract . OPTIONAL { ?person dbp:thumbnail ?thumbnail } FILTER ( ?b_date >= '1488-01-01'^^xsd:date && ?b_date < '1600-01-01'^^xsd:date && ?d_date < '1650-01-01'^^xsd:date ) FILTER ( langMatches(lang(?abstract), 'EN')) } ORDER BY ?person ?b_date";
  
  var url = 'http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=' + encodeURIComponent(query) + '&output=json';

  $.ajax({			 
    url: url,
    dataType: "json",
    success: function (data) {
      $('#results').show();
      $('#raw_output').text(JSON.stringify(data, null, 3));
      handle_json(data);
    },
    error: function(e) {}
  });
}

function handle_json(json) {
  $('#output_div').text("");

  $.each(
    json['results']['bindings'], function(index, value) {
      var html = "";
      name = value['person']['value'].replace("http://dbpedia.org/resource/", "");
      name = decodeURIComponent(name.replace(/_/g, " "));
      html += "<div><h3><b>" + name + ":</b> (" + value['b_date']['value'] + " - " + value['d_date']['value'] + ")</h3></div>";

      if (value['thumbnail'] != null)
        html += "<div class='inline thumb'><img style='width: 200px' src='" + value['thumbnail']['value'].replace("200px", "150px") + "'/></div>";
      else
        html += "<div class='inline thumb'><img src=''/></div>";

      html += "<div class='inline abstract'>" + value['abstract']['value'] + "</div><div class='clear'></div><br>";

      $('#output_div').append(html);
    }
  );
}