private static function convertMultiValue($value)
    {
        $protoMultiValue = new \Attrpubapi\MultiValue();
        $protoMultiValue->mergeFromString($value);
        $items = [];
        foreach ($protoMultiValue->getValues() as $protoValue) {
            $items[] = self::convertValueBasedOnContentType(
                $protoValue->getData(),
                $protoValue->getContentType()
            );
        }
        return new MultiValue($items);
    }