屏幕模板：屏幕为用户提供了交互区域，屏幕模板负责屏幕的布局和内容。

Screen templates: the screen template is responsible for the layout and the content of a screen, which provides an interaction area for the user.

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ValidateUserBean：负责为登录提供的用户标识和密码的认证处理。

ValidateUserBean: responsible for authentication processing for the user id and password provided for login.

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在一个Portal环境中，开发者不负责为用户界面产生HTML，界面通过解析符合Facelet的XHTML文件来产生。

In a Portal environment, the developer is not responsible for generating the HTML for the user interface, its generated by parsing the XHTML files that correspond to the Facelets.

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