docs: @Override
      public boolean isCategoriesURI(final AtomRequest areq) {
          LOG.debug("isCategoriesDocumentURI");
          final String[] pathInfo = StringUtils.split(areq.getPathInfo(), "/");
          if (pathInfo.length == 3 && "categories".equals(pathInfo[2])) {
              return true;
          }
          return false;
      }