public function addRules(array $rules, $ruleset = null)
    {
        if ($ruleset) {
            $newRules = array_merge($this->getRuleset($ruleset), $rules);
            $this->setRuleset($newRules, $ruleset);
        } else {
            $newRules = array_merge($this->getRules(), $rules);
            $this->setRules($newRules);
        }
    }