When the page is loaded, the raw HTML code is preprocessed, which includes, among other actions, setting the class attribute of the node.

加载该页面后，将对原始 HTML 代码进行预处理，其中包括设置 节点的类属性以及其他操作。

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If the same class attribute was defined several times in the code, it will show you all the definitions and which ones were overridden and which are being used.

如果相同的类属性在代码内多次定义，它会显示所有的定义以及哪些定义被覆盖了、哪些定义正在使用。

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Open the MySQLDatabaseSystemUnitValidator class and add a new class attribute for the validator identifier to your source code (see Listing 8).

打开mysqldatabasesystemunitvalidator类，并为确认器标识符向源代码添加一个新的类属性(见于代码清单8)。

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