docs: public List<CmsJspNavElement> getNavigationForFolder(String folder, int level) {
  
          folder = CmsResource.getFolderPath(folder);
          // If level is one just use root folder
          if (level == 0) {
              return getNavigationForFolder("/");
          }
          String navfolder = CmsResource.getPathPart(folder, level);
          // If navigation folder found use it to build navigation
          if (navfolder != null) {
              return getNavigationForFolder(navfolder);
          }
          // Nothing found, return empty list
          return Collections.<CmsJspNavElement> emptyList();
      }