public MapEntryInfoKey(Object value,Object key){
  super(value);
  _hashCode=_hashCode ^ key.hashCode();
  _key=key;
}

public MapEntryInfoKey ( Object value , Object key ) { super ( value ) ; _hashCode = _hashCode ^ key . hashCode ( ) ; _key = key ; }
creates a new mapentryinfokey , used to find existing key in mapversiontable .
