An example of adding the attribute to the element tax is shown in Listing 4.
清单4中显示了向元素tax添加属性的示例。
The declaration of the Unique attribute, shown in Listing 9, is quite simple.
要声明unique属性很简单，如清单9所示。
The declaration of the Unique attribute, shown in Listing 9, is quite simple.
要声明unique属性很简单，如清单9所示。
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