/**
  * {@inheritdoc}
  */
 public function getDerivativeDefinitions($base_plugin_definition)
 {
     parent::getDerivativeDefinitions($base_plugin_definition);
     // The data types will all be set to string since language extends string
     // and the parent class finds the related primitive.
     foreach ($this->derivatives as $plugin_id => $derivative) {
         $this->derivatives[$plugin_id]['data_type'] = 'language';
     }
     return $this->derivatives;
 }
 /**
  * {@inheritdoc}
  */
 protected function generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, DataDefinitionInterface $base_definition, $property_name, DataDefinitionInterface $property_definition)
 {
     if (method_exists($property_definition, 'getType') && $property_definition->getType() == 'entity_reference') {
         parent::generateDerivativeDefinition($base_plugin_definition, $data_type_id, $data_type_definition, $base_definition, $property_name, $property_definition);
     }
 }