docs: private String getFunctionDetailContainerName(CmsResource parent) {
  
          CmsObject cms = getCmsObject();
          String notFound = null;
          String containerInfo = OpenCms.getTemplateContextManager().readPropertyFromTemplate(
              cms,
              parent,
              CmsPropertyDefinition.PROPERTY_CONTAINER_INFO,
              notFound);
          if (containerInfo == notFound) {
              return null;
          }
          Map<String, String> attrs = CmsStringUtil.splitAsMap(containerInfo, "|", "="); //$NON-NLS-2$
          String functionDetailContainerName = attrs.get(KEY_FUNCTION_DETAIL);
          return functionDetailContainerName;
      }