code: function(features) {
          var georss;
          if(OpenLayers.Util.isArray(features)) {
              georss = this.createElementNS(this.rssns, "rss");
              for(var i=0, len=features.length; i<len; i++) {
                  georss.appendChild(this.createFeatureXML(features[i]));
              }
          } else {
              georss = this.createFeatureXML(features);
          }
          return OpenLayers.Format.XML.prototype.write.apply(this, [georss]);
      }
docs: APIMethod: write
  Accept Feature Collection, and return a string.
  
  Parameters:
  features - {Array(<OpenLayers.Feature.Vector>)} List of features to serialize into a string.