另外，专门化的主题使支持XML的搜索更加有效，因为用户可以清楚的区分。

In addition, the specialized topics make XML-aware search more useful, because users can make fine-grained distinctions.

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专门化使MyHTML被定义成html DTD的一种扩展，只在必要时声明新的元素类型，共同的元素则引用HTML DTD。

Specialization lets MyHTML be defined as an extension of the HTML DTD, declaring new element types only as necessary and referencing HTML's DTD for Shared elements.

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