Use SchemaContext to guide NormalizedNode traversal of choices

    private void processChildNode(final Set<Object> values, final DataContainerNode<?> parent,
            final PathArgument arg, final List<QNamePredicate> nodePredicates, final Deque<QNameWithPredicate> path,
            final YangInstanceIdentifier current) {
        final Optional<DataContainerChild<?, ?>> child = parent.getChild(arg);
        if (!child.isPresent()) {
            for (final DataContainerChild<?, ?> mixin : parent.getValue()) {
                if (mixin instanceof AugmentationNode || mixin instanceof ChoiceNode) {
                    addValues(values, mixin, nodePredicates, path, current);
                }
            }
        } else {
            addNextValues(values, child.get(), nodePredicates, path, current);
        }
    }