📅 最后修改于: 2020-12-25 04:45:52 🧑 作者: Mango
DTD(文档类型定义)和XSD(XML模式定义)之间有很多区别。简而言之，DTD对XML结构的控制较少，而XSD(XML模式)提供的控制较多。
重要区别如下：
| No. | DTD | XSD |
|---|---|---|
| 1) | DTD stands for Document Type Definition. | XSD stands for XML Schema Definition. |
| 2) | DTDs are derived from SGML syntax. | XSDs are written in XML. |
| 3) | DTD doesn’t support datatypes. | XSD supports datatypes for elements and attributes. |
| 4) | DTD doesn’t support namespace. | XSD supports namespace. |
| 5) | DTD doesn’t define order for child elements. | XSD defines order for child elements. |
| 6) | DTD is not extensible. | XSD is extensible. |
| 7) | DTD is not simple to learn. | XSD is simple to learn because you don’t need to learn new language. |
| 8) | DTD provides less control on XML structure. | XSD provides more control on XML structure. |