Open jbemmel opened 2 years ago
Agree this should be clarified. It may be hard to change or implement. The identifier resolution is a MUST in YANG 1.1
For C programmers: This is the difference between
#ifdef featureX
and
#if featureX == 1 // error if featureX not defined
YANG 1.1 forces the fragile version. Can YANG 2.0 use the #ifdef interpretation.
Must clarify
Scenario: A software product comes out with a YANG model. It supports extensions referencing its model. In release 2, a new feature is added: featureX
An extension which uses if-feature:featureX is currently incompatible with older versions of the product/YANG model, in which the feature is not defined. There is an error: Failed to resolve feature "featureX"
Instead, the extension should be accepted, treating the feature (and any nodes conditioned on it) as disabled