docs: private Set<CmsUUID> getGroupElementIds(CmsXmlGroupContainer groupContainer, Locale locale) {
  
          Set<CmsUUID> idSet = new HashSet<CmsUUID>();
          CmsGroupContainerBean groupContainerBean = groupContainer.getGroupContainer(getCmsObject());
          if (groupContainerBean != null) {
              for (CmsContainerElementBean element : groupContainerBean.getElements()) {
                  idSet.add(element.getId());
              }
          }
          return idSet;
  
      }