code: private Map<String, List<String>> combineOptionsMaps(final Map<String, List<String>> txtRecordsOptionsMap,
                                                           final Map<String, List<String>> connectionStringOptionsMap) {
          Map<String, List<String>> combinedOptionsMaps = new HashMap<String, List<String>>(txtRecordsOptionsMap);
          for (Map.Entry<String, List<String>> entry : connectionStringOptionsMap.entrySet()) {
              combinedOptionsMaps.put(entry.getKey(), entry.getValue());
          }
          return combinedOptionsMaps;
      }
docs: even for options which multiple values, e.g. readPreferenceTags