[yang-doctors] XPath question

[Andy Bierman <[e-mail]>]

Hi,

RFC 7950 does not say whether unselected case-stmts are visible in XPath.
The bbf-qos-enhanced-scheduling module has a default leaf in 1 case
and a nested node with a must-stmt in a sibling case that references it.

The issue is whether the XPath context includes the default leaf.
Case 'queue' and 'child-schedular-queues' are siblings.
I suspect our code is wrong and the defaults from all cases are visible
to XPath evaluation.


          case queue {
            description
              "The children are a list of queues.";
            leaf contains-queues {
              type boolean;
              *default "true";*
              description
                "Indicates the scheduler contains queues.";
            }
            uses bbf-qos-tm:queues;
          }
          case child-scheduler-queues {
            if-feature "child-scheduler-queue-references";
            container child-scheduler-queues {
              description
                "Configuration to reference one or more queues within
                 one or more child schedulers.";
              list child-scheduler {

                 // ....

                container queues {


* must "../../../../bbf-qos-sched:scheduler-node"                     +
"[bbf-qos-sched:name=current()/../name]/"                     +
"bbf-qos-sched:contains-queues = 'true'" *{
                    error-message
                      "The referenced scheduler must contain queues.";
                    description
                      "The referenced scheduler must contain queues
                       in order for queues to be referenced.";
                  }



Andy