code: function(options) {
          OpenLayers.Protocol.prototype.initialize.apply(this, [options]);
          if(!options.format) {
              this.format = new OpenLayers.Format.SOSGetFeatureOfInterest(
                  this.formatOptions);
          }
      }
docs: Constructor: OpenLayers.Protocol.SOS
  A class for giving layers an SOS protocol.
  
  Parameters:
  options - {Object} Optional object whose properties will be set on the
  instance.
  
  Valid options properties:
  url - {String} URL to send requests to (required).
  fois - {Array} The features of interest (required).