If model data referenced by a value binding expression is no longer available or has changed prior to the component tree being restored, it can result in portions of the tree being dropped.
如果一个值绑定表达式引用的模型数据不再可用，或者在组件树被恢复之前发生了更改，那么组件树的一些部分将被撤销。
Given that JSF does not care to reduce the number of times it resolves a value binding expression, Seam's factory feature often comes in handy.
在JSF不负责减少它解析一个值绑定表达式的次数的情况下，Seam的工厂特性常常变得非常方便。
You might assume that you can stick the logic inside the getter method of the backing bean that maps to the value binding expression in the view.
您可能会认为，可以将逻辑放在映射到视图中值绑定表达式的backingbean的getter方法中。
For example, find the value attribute of the button in the Properties view and click the icon next to it to bring up the familiar binding dialog to generate a JSF binding expression.
例如，找到Properties视图中按钮的值属性，并点击该按钮附近的图标，以打开已见过的捆绑对话框，生成一个JSF捆绑表达式。
When you create component properties that are bound with JSF-EL, you need to create a value binding expression.
在创建使用JSF - EL绑定的组件属性时，需要创建值绑定表达式。
On the "Edit data set parameter binding" pop-up window, click the Open Expression Builder button (to the right of the Value field), as Figure 10 shows.
在“Editdatasetparameterbinding”弹出窗口中，点击openExpressionBuilder按钮(Value字段的右边)，如图10所示。
If the object contains dependency properties with expressions (such as a data binding), the current value of the expression is copied but not the expression itself.
如果物件包含具有运算式(例如资料系结)的相依性属性，则会复制运算式的目前值，而不是运算式本身。
A pair comprising an identifier and a value, where the value may be of any type, may be specified by an expression, and is accessed through use of the binding identifier.
由标识符和值组成的对，其中值可为任何类型，可以通过表达式来规定并可使用联结标识符来访问。
A pair comprising an identifier and a value, where the value may be of any type, may be specified by an expression, and is accessed through use of the binding identifier.
由标识符和值组成的对，其中值可为任何类型，可以通过表达式来规定并可使用联结标识符来访问。
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