code: public function generate()
  	{
  		if (TL_MODE == 'BE')
  		{
  			$objTemplate = new BackendTemplate('be_wildcard');
  			$objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['rssReader'][0]) . ' ###';
  			$objTemplate->title = $this->headline;
  			$objTemplate->id = $this->id;
  			$objTemplate->link = $this->name;
  			$objTemplate->href = 'contao/main.php?do=themes&amp;table=tl_module&amp;act=edit&amp;id=' . $this->id;
  
  			return $objTemplate->parse();
  		}
  
  		$this->objFeed = new \SimplePie();
  		$arrUrls = StringUtil::trimsplit('[\n\t ]', trim($this->rss_feed));
  
  		if (\count($arrUrls) > 1)
  		{
  			$this->objFeed->set_feed_url($arrUrls);
  		}
  		else
  		{
  			$this->objFeed->set_feed_url($arrUrls[0]);
  		}
  
  		$this->objFeed->set_output_encoding(Config::get('characterSet'));
  		$this->objFeed->set_cache_location(System::getContainer()->getParameter('kernel.project_dir') . '/system/tmp');
  		$this->objFeed->enable_cache(false);
  
  		if ($this->rss_cache > 0)
  		{
  			$this->objFeed->enable_cache(true);
  			$this->objFeed->set_cache_duration($this->rss_cache);
  		}
  
  		if (!$this->objFeed->init())
  		{
  			$this->log('Error importing RSS feed "' . $this->rss_feed . '"', __METHOD__, TL_ERROR);
  
  			return '';
  		}
  
  		$this->objFeed->handle_content_type();
  
  		return parent::generate();
  	}
docs: Display a wildcard in the back end
  
  @return string