anchor.diff:  MonetaryAmount amountInUSD = ...;
   MonetaryAmount amountInCHF = amountInUSD.with(conversion);
   --------------------------------------------
  -
  +////
  +
  +[source,java]
  +.+ExchangeRateProvider+ から +CurrencyConversion+ を取得する
  +--------------------------------------------
  +ExchangeRateProvider rateProvider = MonetaryConversions.getExchangeRateProvider();
  +CurrencyConversion conversion = rateProvider.getConversion("CHF");
  +
  +MonetaryAmount amountInUSD = ...;
  +MonetaryAmount amountInCHF = amountInUSD.with(conversion);
  +--------------------------------------------
   
   === Exchange Rate Providers
   
  
positive.code: }
  --------------------------------------------
  
  == Currency Conversion
  
  === Basics
  
negative.code: ExchangeRateProvider rateProvider = MonetaryConversions.getExchangeRateProvider();
  ExchangeRate eurToChfRate = rateProvider.getExchangeRate("EUR", "CHF");
  --------------------------------------------
  ////
  
  最後に、プロバイダチェーンの定義は完全に省くこともできます。
  この場合、デフォルトのプロバイダチェーンが使われます。
  
  [source,java]
  .デフォルトのプロバイダチェーンから +ExchangeRate+ を取得する
  --------------------------------------------
  ExchangeRateProvider rateProvider = MonetaryConversions.getExchangeRateProvider();
  ExchangeRate eurToChfRate = rateProvider.getExchangeRate("EUR", "CHF");
  --------------------------------------------
  
  ////
  ==== Extracting a +CurrencyConversion+
  
  A +CurrencyConversion+ extends +MonetaryOperator+ and is therefore directly applicable on every +MonetaryAmount+.
  Hereby a +CurrencyConversion+ instance is always bound to a terminating currency and an underlying +ExchangeRateProvider+.
  As a consequence each +ExchangeRateProvider+ allows to get a +CurrencyConversion+ instance by passing the terminating
  currency:
  ////
  
  ==== +CurrencyConversion+ を取得する
  
  +CurrencyConversion+ は +MonetaryOperator+ を継承しています。
  したがって、 +MonetaryAmount+ に対する演算子として使えます。
  +CurrencyConversion+ のインスタンスには、換算先の通貨と、用いられる +ExchangeRateProvider+ が紐付いています。
  +ExchangeRateProvider+ に換算先の通貨を渡すことで、 +CurrencyConversion+ のインスタンスが取得できます。
  
  ////
  
  [source,java]
  .Getting a +CurrencyConversion+ from an +ExchangeRateProvider+
  