code: public static void unregisterMetaElementFromThisRequest (@Nullable final String sMetaElementName)
    {
      final MetaElementList aSet = _getPerRequestSet (false);
      if (aSet != null)
        aSet.removeMetaElement (sMetaElementName);
    }
docs: Unregister an existing meta element only from this request
  
  @param sMetaElementName
  The name of the meta element to be removed. May not be
  <code>null</code>.