private static function is_selector_software_type($id)
 {
     $yes = false;
     foreach (pts_types::test_profile_software_types() as $subsystem) {
         if (strtolower($subsystem) === $id && $subsystem != 'BaseTestProfile') {
             // virtual suite of all supported tests by a given SoftwareType
             $yes = $subsystem;
             break;
         }
     }
     return $yes;
 }