docs: function (object, action, options) {
                  var ret = {};
                  for (var key in object) {
                      if (object.hasOwnProperty(key)) {
                          var value = this._getCompositionValue(object[key], key, action, options);
  
                          if (value !== undefined) {
                              ret[key] = value;
                          }
                      }
                  }
  
                  return ret;
              }