专门化使MyHTML被定义成htmlDTD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.
专门化使MyHTML被定义成htmlDTD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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