docs: private void generateResponses(final Metadata m, final Element e) {
          if (m.getResponses() == null || m.getResponses().length == 0) {
              return;
          }
          final Element responsesElements = new Element("responses", NS);
          for (final String response : m.getResponses()) {
              addNotNullElement(responsesElements, "response", response);
          }
          e.addContent(responsesElements);
      }