function retrieveData() {
  var url = 'http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=' + encodeURIComponent($('#query').text()) + '&output=json';

  $.ajax({			 
    url: url,
    dataType: "json",
    success: function (data) {
      handle_json(data);
    },
    error: function(e) {}
  });
}

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

  $('#output_div').append("<table>");
  $.each(
    json['results']['bindings'], 
    function(index, value) {
      var html = "";
      html += "<tr><td>" + value['town']['value'] + "</td>";
      html += "<td>" + value['province']['value'] + "</td>";
      html += "<td>" + value['population']['value'] + "</td>";
      html += "<td>" + value['area']['value'] + "</td>";
      html += "<td>" + value['mayor']['value'] + "</td></tr>";

      $('#output_div').append(html);
    }
  );
  $('#output_div').append("</table>")
}