public static <V>Mapping<Map<String,V>> map(Mapping<V> vBase,Constraint... constraints){
  return map(text(),vBase,constraints);
}

public static < V > Mapping < Map < String , V > > map ( Mapping < V > vBase , Constraint ... constraints ) { return map ( text ( ) , vBase , constraints ) ; }
( mapping ) convert to map of values
