Re: [netmod] removing a node from a grouping

[Robert Wilton]

Hi Kent,

I don't think that this is a valid use of augment - I thought that 
augment can only add news data nodes, not add extra sub statements to 
existing ones.

Also, YANG allows grouping to be changed so that it is constructed from 
sub groupings, at long as the original grouping name is preserved and is 
only updated in a backwards compatible way.  But as you say, this can 
still lead to unnatural groupings.

I still think that groupings are probably being overused.  Perhaps 
Andy's clone statement might be a better alternative in some cases 
(https://github.com/netmod-wg/yang-next/issues/31).

Thanks,
Rob


On 14/07/2018 18:46, Kent Watsen wrote:
Hi Rob,

Right you are, "refine" doesn't have a "when" substatement, but "augment" does.

     grouping "bar-etc" {
       uses "foo-bar-etc" {
         augment "foo" {
           when "false()";
         }
       }
     }


The problem with splitting up groupings is that 1) it needs to be done
beforehand and 2) it may produce "unnatural" groupings that wouldn't be
there otherwise.

Kent


===== original message =====

Hi Kent,

I'm not sure that sec 7.13.2 of 7950 allows refine to add a when
statement, although an equivalent solution would be refine it with an
if-feature statement for a feature that is never enabled.

Ideally, I think that the groupings would be split up, so that they
build on each other.

    grouping "foo" {
      container-or-leaf "foo" { ... }
    }

    grouping "bar-etc" {
      container-or-leaf "bar" { ... }
      ...  // the "etc" ;)
    }

    grouping "foo-bar-etc" {
      grouping "foo";
      grouping "bar-etc";
    }

Thanks,
Rob

On 11/07/2018 18:30, Kent Watsen wrote:
Say there is:

    grouping "foo-bar-etc" {
      container-or-leaf "foo" { ... }
      container-or-leaf "bar" { ... }
      ...  // the "etc" ;)
    }

And the goal is to use the grouping sans the "foo" node.
Can a "when" statement that always evaluates to "false"
do it?

    grouping "bar-etc" {
      uses "foo-bar-etc" {
        refine "foo" {
          when "false()";
        }
      }
    }

Any better ideas?

Thanks,
Kent



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