验证和约束信息将帮助驱动ui并使应用程序更易于使用，因为应用程序可能根据用户输入更改可用的选择和ui元素。
Validation and constraint information will help to drive the UI and make the application easier to use, as the application might change the available choices and UI elements based on user input.
确定规模和范围是驱动项目各个方面的动力，约束那些在产品的开发和升级中所采用的行动，以及限制可以提供的选项。
Sizing and scoping drives every aspect of the project, constrains the actions that can be taken in the development or upgrade of a product, and limits available options.
设备驱动处于内核之上，运行在用户态。每个驱动都作为单独的进程运行，受到内存管理硬件的严格约束，只能访问自己拥有的内存。
Above the kernel, running in user mode, are the device drivers, each one running as a separate process tightly restricted by the memory management hardware to accessing only its own memory.
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