XML DTD详解
一个有效的XML文档一定是结构规范的，结构规范的XML文档纷歧定是有效的，即有效的是格式规范的一个子集。这篇文章具体介绍DTD，包括其对元素的定义，属性的定义，以及实体的定义。(A valid XML document must be structurally standardized. Structurally standardized XML documents must be valid, that is, valid is a subset of format specifications. This article specifically introduces DTD, including its definition of elements, attributes, and entities.)
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