Hello,
we have tried implementing the YANG module [email protected]
from draft-ietf-netconf-rfc7895 and have encountered a problem. I am not
completely certain that the issue is with the model and not our XPath
evaluator, but based on the definitions I have found I believe the model is
wrong.
module: ietf-yang-library
+--ro yang-library
+--ro module-set* [name]
+--ro module* [name]
+--ro name yang:yang-identifier
+--ro deviation* [module]
+--ro module -> ../../name
In the tree diagram (I have removed irrelevant parts) it can be seen that there
is a "deviation" leafref that should point from one "module" list instance to
another identifying the deviation module. So, the supposed evaluation should
take the following steps: we start with leaf "module" we take ".." path so we
get the "deviation" list. Then we take another ".." and we end up with all the
"module" list instances. Finally, we try to find "name" leaf in all these
instances of the "module" list.
However, our evaluator and some I have found online (all behaving according to
XPath definition, I think) proceed differently. At the point of going one step
up (parent node) into what es expected to be all the "module" list instances,
the context node actually becomes only the *specific module list instance* we
have started from, so when looking for the "name" leaf only the name of this
list instance is taken into consideration. Needless to say, the evaluation
never finds a matching "name" leaf because "module/name" and
"module/deviation/module" should never match in one "module" list instance and
so the validation always fails.
Kind regards,
Michal Vasko
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