protected function parseAttributeValue($profile, $attribute, $value)
    {
        // If it's a HTML attribute
        if ($profile == LinkType::HTML_PROFILE_URI) {
            switch ($attribute) {
                // Space delimited lists
                case 'sizes':
                    return array_filter(preg_split('/\040+/', $value));
                // Space or comma delimited lists
                case 'charset':
                    return array_filter(preg_split('/[,\040]+/', $value));
            }
        }

        return [$value];
    }