Based on a document's DTD, assistance is provided for elements or other tag names, attribute names, and attribute values.
根据文档的DTD，可为元素或其它标记名称、属性名称及属性值提供辅助。
As with a DTD, the top level of a particular object or XML document can be any tag whose rules are given.
与DTD中的相同，最高级别的特定对象或XML文档可以是给定规则的任何标记。
Although you could create a new element equivalent for any tag in a general DTD, this work is useless to you as an author unless the content models that would include the tag are also specialized.
虽然可以为一般dtd中的任何标记创建新的等价元素，但是除非内容模型包含也进行专门化的标记，否则这对作者来说毫无用处。
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