在一个应用程序中仅有几个地方能够实现性能增益 - 表示层、应用层和存储层。
There are only a few places to implement performance gains in an application – the presentation layer, the application layer, and the storage layer.
RFC 5023: The Atom Publishing Protocol：查阅关于这个基于 HTTP 的应用层协议，该协议以 Atom 格式的表示形式发布和编辑 Web 资源。
RFC 5023: The Atom Publishing Protocol: Read about this HTTP-based, application-level protocol for publishing and editing Web resources as Atom-formatted representations.
表示层保证由一个系统的应用层所发出的信息，另一个系统的应用层可以读懂。
The presentation layer ensures that the information that the application layer of one system sends out is readable by the application layer another system.
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