docs: private List<CmsContainerElementBean> getGroupContainerElements(CmsResource resource) throws CmsException {
  
          CmsXmlGroupContainer xmlGroupContainer = CmsXmlGroupContainerFactory.unmarshal(
              getCmsObject(),
              resource,
              getRequest());
          CmsGroupContainerBean groupContainer = xmlGroupContainer.getGroupContainer(getCmsObject());
          return groupContainer.getElements();
      }