At the heart of DITA, representing the generic building block of a topic-oriented information architecture, is an XML document type definition (DTD) called "the topic DTD."
DITA的核心是一个称为“主题DTD”的XML文档类型定义(DTD)，代表面向主题的信息体系结构的一般构造块。
Constraints of type III allow the definition of constraints to evaluate dependencies between content stored in different HL7 CDA XML document instances.
类型III的约束允许定义约束来评估存储在不同的HL7 CDA XML文档实例内的内容之间的依赖性。
In the former type of processing, it is necessary to read a "document type Definition" (DTD) prior to reading an XML document it applies to.
在以前的处理类型中，读取XML文档之前，必须先读取“文档类型定义”(DTD)。
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