Consider the specialization hierarchy for a reference topic.
下图是一个引用主题的专门化层次结构。
Define the specialization hierarchy for the element with class attribute.
为具有class属性的元素定义专门化层次结构。
Each level of specialization has its own set of class attributes, which in the end provide the full specialization hierarchy for all specialized elements.
每个层次的专门化都有自己的一组class属性，最终提供了所有专门化元素的专门化层次结构。
Even if you had a specialization hierarchy 10 levels deep or more, the attributes would still allow unambiguous mappings to each ancestor information type.
即使专门化层次超过10层，该属性仍然能够毫无歧义地映射到每个祖先信息类型。
Even if you had a specialization hierarchy 10 levels deep or more, the attributes would still allow unambiguous mappings to each ancestor information type.
即使专门化层次超过10层，该属性仍然能够毫无歧义地映射到每个祖先信息类型。
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