/**
  * Check current directive context on allowed (in what context this directive can be placed)
  * @param iContext $context
  * @return bool
  */
 protected function isAllowedContext(iContext $context)
 {
     if ($context->getFullName() == Unknown::getFullName()) {
         return true;
     }
     return is_null($this->allowedContext) ? true : in_array($context->getName(), $this->allowedContext);
 }