The process of validation checks the XML against a Document TypeDefinition (DTD), which may be part of the XML or external to it.
确认过程根据文档类型定义(DTD)来检查XML, DTD可以是XML的一部分,也可以在它的外部。
2
This tutorial lays the groundwork for Part 2, which focuses on information modeling, including the use of namespaces and the definition of Document Type definition (DTD) schemas.