title: why is array undefined?
body: <p>when executing the following code firebug tells me: <em>values[this.geo.value] is undefined</em>
  what is the problem?</p>
  
  <pre><code>$.get('./RDFexamples/tin00089_test2.rdf', null, function (rdfXml) {
  var rdf, json = {};
  var values = new Array();
  
  rdf = $.rdf()
      .load(rdfXml)
      .prefix('', 'http://ontologycentral.com/2009/01/eurostat/ns#')
      .prefix('qb', 'http://purl.org/linked-data/cube#')
      .prefix('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#')
      .prefix('dcterms', 'http://purl.org/dc/terms/')
      .prefix('sdmx-measure', 'http://purl.org/linked-data/sdmx/2009/measure#')
      .where('?observation a qb:Observation')
      .where('?observation dcterms:date ?date')
      .where('?observation sdmx-measure:obsValue ?measure')
      .where('?observation :geo ?geo')
      .each(function () {
          values[this.geo.value].push(this.measure.value);
          //alert(this.date.value)
          //alert(this.measure.value)
          //alert(this.geo.value)
      }
      );
      alert(values);
  });
  </code></pre>