The data is bound to the input control, so if the user enters a new value it will be propagated to the model automatically before the HTTP POST is made back to the server.
数据绑定到输入控件，用户输入的新数据在HTTP POST到服务器之前将自动传递给模型。
The ref attribute specifies the XPath that the input data should be bound to.
re f属性指定输入数据应该绑定的XPath。
The input field is bound to instance data.
输入字段绑定到实例数据。
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