public function get()
    {
        if (empty($this->raw_data)) {
            return array();
        }

        $regexp = '/(' . preg_quote(self::SEPARATOR_ELEMENT, '/')
            . '|' . preg_quote(self::SEPARATOR_ITEM, '/') . '[0-9]+' . preg_quote(self::SEPARATOR_LEVEL, '/')
            .')/';

        return preg_split($regexp, $this->raw_data);
    }