docs: private static void parseSsextensions(JSONObject modelJSON,
                                            Diagram current) throws JSONException {
          if (modelJSON.has("ssextensions")) {
              JSONArray array = modelJSON.getJSONArray("ssextensions");
              for (int i = 0; i < array.length(); i++) {
                  current.addSsextension(array.getString(i));
              }
          }
      }