处理根组件是设计器宿主、设计时环境和用户界面之间的粘合剂的唯一需要技巧的部分。
Handling the root component is the only tricky part of the adhesive between the designer host, the design-time environment, and the user interface.
可视化：便于授权用户查看特定部署环境上的定制项(应用程序中可定制的部分)和赋给这些定制项的值。
Visibility: it should be easy for authorized users to view both the customization points (i.e. which parts of the application can be customized) and the values assigned to them in a given environment.
“极端编程”方法中，用户情景要求一个现场的客户提供部分环境。
Under the Extreme Programming method, user stories require an on-site customer to provide partial context.
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