docs: public boolean isDefaultGroup(String groupName) {
  
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(groupName)) {
              return false;
          }
  
          // first check without ou prefix, to stay backwards compatible
          boolean isDefault = m_groupAdministrators.equals(groupName);
          isDefault = isDefault || m_groupGuests.equals(groupName);
          isDefault = isDefault || m_groupUsers.equals(groupName);
  
          // now check with ou prefix
          isDefault = isDefault || groupName.endsWith(CmsOrganizationalUnit.SEPARATOR + m_groupAdministrators);
          isDefault = isDefault || groupName.endsWith(CmsOrganizationalUnit.SEPARATOR + m_groupGuests);
          isDefault = isDefault || groupName.endsWith(CmsOrganizationalUnit.SEPARATOR + m_groupUsers);
  
          return isDefault;
      }