Protobuf is about serializing and deserializing data, not enforcing
restrictions on it. ("required" being the odd case there, and it is
often recommended that you avoid it.) Using repeated in the spec, and
then enforcing any additional restrictions in your code is the
preferred way to go. That way, different users will be compatible at
the wire level, but you are free to change requirements as necessary.

On Tue, Oct 8, 2013 at 1:52 AM, Dror Cohen <drorco...@gmail.com> wrote:
> Hi,
> if I have a field that is required to show at least 1 time but can occur a
> few times - What's the expected decleration in the proto file?
> I can think of the following options:
> 1. Just using repeated isn't good enough - it has to appear at least once.
> 2. Use first option and force a check in my code - seems to misuse the whole
> versionning system.
> 3. Using one field with required and then a field with repeated - code looks
> bad.
>
> I'm inclined to the first option - only because in the future the field
> might become totally optional/removed (not that I can think of that
> happening but you can never know).
>
> Your thoughts/ Suggestions?
>
> Dror
>
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