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("");
  $.each(
    json['results']['bindings'], 
    function(index, value) {
      $('#output_div').append(index + " " + value['x']['value'] + "<br>");
    }
  );
}