/**
* Attempt to import the FormRule class file if it isn't already imported.
* You can use this method outside of Form for loading a rule for inheritance or composition.
*
* @param string $type Type of a rule whose class should be loaded.
*
* @return string|boolean Class name on success or false otherwise.
*
* @since 1.7.0
*/
public static function loadRuleClass($type)
{
return self::loadClass('rule', $type);
}