+$url = parse_url($src_url);
+if (FALSE === $url || empty($url["host"]))
+ die("Invalid url: $src_url\n");
+
+$stylesheet = __DIR__ . "/rss_converter_" . $url["host"] . ".xsl";
+if (FALSE === file_exists($stylesheet))
+ die("Conversion to RSS not supported: {$url["host"]}\n");