运行该应用程序将在窗口中显示来自数据源的数据，并允许您浏览数据记录并根据需要进行修改。
Running the application displays the data from the data source in the form, and allows you to browse through the records and modify the data as needed.
请考虑一下缺少权威性的可信的数据源或单一记录系统，会怎么样？
Consider the lack of an authoritative, trusted source or single system of record as an illustrative example.
框架查询两个元数据源：活动记录模型和每个模型对象的定制元数据文件。
The framework queries two sources of metadata: the Active Record model and a custom metadata file for each model object.
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