public RoutingNodeIterator skip(int num) {
        for (int i = 0; i < num && isValid(); ++i) {
            next();
        }
        return this;
    }
Skips the given number of children.

@param num The number of children to skip.
@return This, to allow chaining.
messagebus/src/main/java/com/yahoo/messagebus/routing/RoutingNodeIterator.java