public OuterJoinQualifier add(String propertyLeft,String propertyRight){
  additionalProperties.add(new PropertyValueExpressionPair(new PropertyValueExpression(propertyLeft),new PropertyValueExpression(propertyRight)));
  return this;
}

public OuterJoinQualifier add ( String propertyLeft , String propertyRight ) { additionalProperties . add ( new PropertyValueExpressionPair ( new PropertyValueExpression ( propertyLeft ) , new PropertyValueExpression ( propertyRight ) ) ) ; return this ; }
add additional properties to the on - clause , which are logical - and to existing properties
