docs: @Override
    protected MkCoPEntry createNewDirectoryEntry(MkCoPTreeNode<O> node, DBID routingObjectID, double parentDistance) {
      return new MkCoPDirectoryEntry(routingObjectID, parentDistance, node.getPageID(), node.coveringRadiusFromEntries(routingObjectID, this), null);
      // node.conservativeKnnDistanceApproximation(k_max));
    }