protected function extractKeyValues($key) {
        $formattedKey = substr(str_replace("L_", "", $key), 0, -preg_match_all( "/[0-9]/", $key ));
        return array(
            substr($key, -preg_match_all( "/[0-9]/", $key )),
            $this->getMappedKeyName($formattedKey),
            $formattedKey
        );
    }