docs: function (modelClass, options) {
                  var config = this.getConfigurationForModelClass(modelClass);
  
                  if (config && config.$.processor) {
                      var processorName = config.$.processor;
                      if (this.$processors[processorName]) {
                          return this.$processors[processorName];
                      } else {
                          throw "Processor for '" + processorName + "' not an instance of js.data.DataSource.Processor.";
                      }
                  }
              }