User interaction: the user interaction layer allows a user to interact with an application (for example, visualizing information stored in the database).
用户交互层：用户交互层让用户可以与应用程序交互(例如，显示数据库中存储的信息)。
In the following section, XForms for viewing and manipulating data stored in the database are created, providing the third layer, namely the "User Interaction" layer, illustrated in Figure 4.
在接下来的小节中，创建用于查看和操作数据库中存储的数据的XForm，这是第三层，即“用户交互”层，如图4所示。
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