当逻辑标签具有属性“name”时，就应该检查是否存在这个指定名的JSP bean。

When the logic tag is with attribute "name", it is to check for the existence of a JSP bean with the specified name, in any scope.

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该检查模块能够正确找出已编写程序的语法和一些简单的逻辑错误，对后续开发具有指导意义。

This checking module can correctly find syntax errors and some simple logical errors of the diagram program, which provides guidance for the further development.

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