在Products视图操作中，您可以查看用户是否有更新或删除产品的权限，并设置用于显示或隐藏视图中按钮的变量。
In the Products view action, you could check to see if the user has permission to update or delete the product and set variables that can be used to display or hide the buttons in the view.
与shell中的其他操作一样，环境变量可以控制每次shell显示提示符时应显示的内容。
Much like other operations in the shell, an environment variable controls what's drawn each time the shell presents a prompt.
清单25显示了如何保存当前操作以及到两个XSL变量的相应元素的引用。
Listing 25 shows how to save the current action and a reference to the corresponding element in two XSL variables.
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