DOM maps those elements to one generic element class.
DOM将这些元素映射到一个一般性的元素类。
A sample of valid data associated with this schema that USES the generic element extension is in Listing 2.
清单2展示了与这个使用通用元素扩展的模式关联的有效数据的样例。
Create another module to declare a set of mapping attributes for the new elements that point to the generic element types that they specialize.
创建另外一个模块，声明新元素的一组映射属性指向它们专门化的类属元素类型。
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