code: private void updateNavPos(CmsResource res, CmsSitemapChange change) throws CmsException {
  
          if (change.hasChangedPosition()) {
              applyNavigationChanges(change, res);
          }
      }
docs: Updates the navigation position for a resource.<p>
  
  @param res the resource for which to update the navigation position
  @param change the sitemap change
  
  @throws CmsException if something goes wrong