SOA 还包含更改组件的输入和输出数据签名的适配器；适配器能以很小的性能开销为代价将服务的客户机与其接口的更改隔离。
SOA also includes adapters that change the input and output data signatures of component operations; adapters insulate a service’s clients from changes in its interface at a slight performance cost.
这不仅能减少网络开销和各个应用程序层次间的通信量，而且还向与业务保持一致的服务接口迈进了一大步。
This not only reduces the network overhead and chattiness between various application tiers, it also is a big step toward business alignment of service interfaces.
要访问SAX中的一些信息，必须将对象强制转化成不同的接口，这样就带来了性能上的开销。
To access some information in SAX, you need to cast an object to a different interface; this carries a performance cost.
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