docs: private List<File> getContainerPagesToPurge(CmsObject cms, CmsUUID targetId) {
  
          try {
              List<File> purgePages = new ArrayList<File>();
              List<CmsRelation> relations = cms.readRelations(CmsRelationFilter.relationsToStructureId(targetId));
              for (CmsRelation relation : relations) {
                  CmsResource source = null;
                  try {
                      source = relation.getSource(cms, CmsResourceFilter.ALL);
                  } catch (CmsPermissionViolationException e) {
                      // export user can't read the file
                      continue;
                  }
                  if (CmsResourceTypeXmlContainerPage.isContainerPage(source)) {
  
                      // purge pages directly containing the content
  
                      String vfsName = source.getRootPath();
                      String rfsName = OpenCms.getStaticExportManager().getRfsName(cms, vfsName);
                      String exportPath = CmsFileUtil.normalizePath(
                          OpenCms.getStaticExportManager().getExportPath(vfsName));
                      String rfsExportFileName = exportPath
                          + rfsName.substring(OpenCms.getStaticExportManager().getRfsPrefix(vfsName).length());
                      File file = new File(rfsExportFileName);
                      purgePages.add(file);
                  } else if (targetId.equals(source.getStructureId())
                      && OpenCms.getResourceManager().getResourceType(source.getTypeId()).getTypeName().equals(
                          CmsResourceTypeXmlContainerPage.GROUP_CONTAINER_TYPE_NAME)) {
                      LOG.warn(
                          Messages.get().getBundle().key(
                              Messages.LOG_WARN_ELEMENT_GROUP_REFERENCES_SELF_1,
                              source.getRootPath()));
                  } else if (OpenCms.getResourceManager().getResourceType(source.getTypeId()).getTypeName().equals(
                      CmsResourceTypeXmlContainerPage.GROUP_CONTAINER_TYPE_NAME)) {
                      // purge pages containing group containers containing the content
  
                      purgePages.addAll(getContainerPagesToPurge(cms, source.getStructureId()));
                  }
              }
              return purgePages;
          } catch (CmsException e) {
              LOG.error(e.getLocalizedMessage(), e);
              return Collections.emptyList();
          }
      }