在每个透视图中，都重点强调了构成此项目的基础文件集的某些方面，对另一些方面进行了重新安排，同时还降低了一些方面的重要性或将其完全隐藏。
In each perspective, certain aspects of the underlying set of files that make up the project are emphasized, others are rearranged, still others are de-emphasized or hidden altogether.
如果数据模型很大，或者需要向用户隐藏某些数据，可以从外部XML文件加载实例(如清单5所示)。
If you have a large data model, or you have data that needs to be hidden from users, you can load an instance from an external XML file (see Listing 5).
剪辑并粘贴这一程序时请注意，因为XML文件中可能包含了某些隐藏的HTML内容(尤其是换行)，它将导致不能易发现的错误。
Be careful if you cut and paste this code as there may appear some hidden HTML content in your XML file, especially at line breaks that cause trouble not easy to retrieve.
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