How to hide a leaf-list node when a particular list is chosen?

arun88 · April 16, 2020, 3:34am

My YANG model is this:

list appA
{
uses app-policy-grouping;
}
list appB
{
uses app-policy-grouping;
}

grouping app-policy-grouping
{
leaf-list val1
{
}
leaf-list val2
{
}
leaf-list val3
{
}
}

I want to hide leaf-list node val3 if the parent node is appA. How do I do it? Do I say

leaf-list val3
{
  when "../appA";
}

Or do I use tailf:depedency extension? If so, how do I use tailf:depedency?

cohult · April 16, 2020, 9:27am

The XPath expression for the when statement:

    leaf-list val3 {
      type string;
      when "name(..)='my-prefix:appA'";
    }

Another alternative is to add the below to an annotation module:

tailf:annotate "/my-prefix:appA/my-prefix:val3" {
    tailf:hidden full;
}

arun88 · April 16, 2020, 7:07pm

@cohult, thanks. Could you tell me what my-prefix here is? Is it an internal keyword?

Also, what if I have another app named appAAA? Would the prefix check still work for just appA?

cohult · April 16, 2020, 7:41pm

At the top of your YANG model, look for the “prefix your-prefix-name” statement.
YANG 1.1 RFC description: RFC 7950 - The YANG 1.1 Data Modeling Language

Anyway, if you want to/can skip the prefix, just use “local-name”

    leaf-list val3 {
      type string;
      when "local-name(..)='appA'";
    }

    leaf-list val3 {
      type string;
      when "starts-with(local-name(..), 'appA')";
    }