code: function(request) {
          var doc = request.responseXML;
          if (!doc || !doc.documentElement) {
              doc = request.responseText;
          }
          if (!doc || doc.length <= 0) {
              return null;
          }
          return this.format.read(doc);
      }
docs: Method: parseFeatures
  Read HTTP response body and return features.
  
  Parameters:
  request - {XMLHttpRequest} The request object
  
  Returns:
  {Array({<OpenLayers.Feature.Vector>})} or
  {<OpenLayers.Feature.Vector>} Array of features or a single feature.