private function _validateYear()
{
$validators = array();
$greaterThan = new Zend_Validate_GreaterThan('0000');
$greaterThan->setMessage($this->translate('publish_validation_error_year_greaterthan'), Zend_Validate_GreaterThan::NOT_GREATER);
$validators[] = $greaterThan;
$validInt = new Zend_Validate_Int();
$messages = array(Zend_Validate_Int::INVALID => $this->translate('publish_validation_error_year_intinvalid'), Zend_Validate_Int::NOT_INT => $this->translate('publish_validation_error_year_notint'));
$validInt->setMessages($messages);
$validators[] = $validInt;
return $validators;
}