code: @Override
    public HashMap<String, String> getValuesMap() {
      if (optionsHolder == null ) return null;
      else return optionsHolder.getOptionsMap();
    }
docs: Returns a HashMap of the named query options from the server.
  
  The keys are the names of the query options, the values are the corresponding URIs on the server.
  
  @return The map of names to URIs.