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。
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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