docs: private void generateComments(final Metadata m, final Element e) {
          final Element commentsElements = new Element("comments", NS);
          for (final String comment : m.getComments()) {
              addNotNullElement(commentsElements, "comment", comment);
          }
          if (!commentsElements.getChildren().isEmpty()) {
              e.addContent(commentsElements);
          }
      }