Base attribute, whose value is the qualified name of the base data type.

属性，该属性的值为基数据类型的限定名。

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In our case project, we determine that 30 percent of our Age attribute is Base code and 70 percent is New.

在我们的案例项目中，我们确定使用30%的阶段属性是基础代码，70%的是新代码。

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A subtype can also add more element and attribute declarations to the base type.

子类型也可以向基类型增加更多的元素和属性声明。

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