所有JSF HTML标签都有一个rendered属性，该布尔值决定了HTML窗口部件是否将显示给用户。

All JSF HTML tags have a rendered attribute, the Boolean value of which decides whether the HTML widget will be shown to the user or not.

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它们的安全性与其核心设计部件布尔函数有着密切的关系。

Their security has close relationship with Boolean function which is the core design part of them.

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