此外，这个练习使用了Cocoa框架，它是由一组api、程序库和组成iPhone SDK开发层的运行时代码所构成的。
Also, this exercise USES the Cocoa framework, which consists of a set of APIs, libraries, and run time code that forms the development layer for the iPhone SDK.
该版本只需System . XML与核心运行时即可，这对于那些想要使用XAML但又不想加载Fx程序库的应用来说再适合不过了。
This version only needs System.XML and the core runtimes, making it much more suitable for applications that want to use XAML without loading the Fx libraries.
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