docs: private Map<String, Element> cloneElementMap(final Map<String, Element> current) {
          final Map<String, Element> topicMetaTable = new HashMap<>(16);
          for (final Entry<String, Element> topicMetaItem: current.entrySet()) {
              topicMetaTable.put(topicMetaItem.getKey(), (Element) resultDoc.importNode(topicMetaItem.getValue(), true));
          }
          return topicMetaTable;
      }