> I meant the current work is using extensions instead of new language 
> statements.
> Not that the yang-version will never be changed in the future.

Ah, okay.


> It is not a matter of "when" if new functionality is added via extensions.
> In theory the WG could add new functionality to YANG 1.1 this way for years.
> In practice it might be difficult to achieve widespread interoperability if 
> nobody
> agrees what "YANG next"  actually contains. Also, YANG 1.1 clearly says a 
> tool MAY
> skip over and ignore ANY external statement, so it is problematic to use 
> extension-stmt
> as if it was defining real statements. It is better to have a tool clearly 
> fail
> with an "unsupported YANG version" error than it is to silently ignore 
> external statements.

Agreed.


K.


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