Yes I have google a few times, but nothing that I got was usefull :(

What I want to understand more is this: The way PB is constructed, an 
old SW can talk to an newer SW and they can get along using only what 
they understand, with little extra programing.

That per-se is probably close to what is called backward-and-forward 

Just an example, if you plug a new SATA2 drive in an older machine and 
it works, the other way around too. (It uses a serial protocol too)

What I want is to study what is behind those nice tricks.

thanks for your attention,

Alek Storm escreveu:
> Could you clarify a little more?  I'd be happy to help, but you have 
> tried Googling this, right?
> On Mon, Jun 8, 2009 at 6:54 PM, Alain M. < 
> <>> wrote:
>     Hi,
>     One of the big advantages of ProtBuf is the ability to make
>     comunications Forward *and* backward compatible beween versions.
>     I would like to study the matter a little more, preferably not directly
>     related to PB, but in a neutral background (even XML could be).
>     Can enyone send some reference about this topic?
>     Thanks,
>     Alain Mouette
>     > 
> -- 
> Alek Storm

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