docs: @Nullable
    private ICommonsOrderedMap <String, RequestParamMapItem> _getChildMapExceptLast (@Nonnull @Nonempty final String... aPath)
    {
      ValueEnforcer.notEmpty (aPath, "Path");
  
      ICommonsOrderedMap <String, RequestParamMapItem> aMap = m_aMap;
      // Until the second last object
      for (int i = 0; i < aPath.length - 1; ++i)
      {
        aMap = _getChildMap (aMap, aPath[i]);
        if (aMap == null)
          return null;
      }
      return aMap;
    }