code: public CmsAccessControlEntry withNulledResource() {
  
          return new CmsAccessControlEntry(
              null,
              m_principal,
              m_permissions.getAllowedPermissions(),
              m_permissions.getDeniedPermissions(),
              m_flags);
      }
docs: Returns a copy of the access control entry with the resource id nulled.<p>
  
  @return a copy of this entry with a nulled resource id