Re: [yang-doctors] Question on when statment and container presence

[Martin Björklund <[e-mail]>]

Hi,

Christian Hopps <[e-mail]> wrote:
> Hi,
> 
> The libyang folks have made a change in their libyang2 branch. The
> chnage is causing containers to be implicitly marked as presence
> containers if they include a "when" statement i.e.,:
> 
> module main {
>   yang-version 1.1;
>   namespace "http://example.com/main";
>   prefix m;
> 
>   leaf afi-safi-name {
>     type string;
>   }
>   container ipv4-flowspec {
>     when "../afi-safi-name = 'ipv4-flowspec'";
>     leaf flowspec-config {
>       type uint8;
>     }
>   }
> }
> 
> So in this case "ipv4-flowspec" is being changed as if it had a
> presence statement.

This is not correct.  If the when evaluates to 'true', it should not
be possible to delete the ipv4-flowspec container - which would be
possible it if had a presence statement.


/martin



> 
> On of the authors indicated that this was supported indirectly by some
> mail on netmod; however, my search is not turning anything up.
> 
> I think this is incorrect as the presence of the container based on
> the when is an "implicit" (some other leaf value is set) not
> "explicit" meaning.
> 
> Thoughts?
> 
> Thanks,
> Chris.