Information management, which includes both data and content management, is an essential building block for Service-Oriented Architecture (SOA).

信息管理，既包括了数据管理，还包括了内容管理，它是面向服务的体系结构(SOA)的基本构建模块。

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The building block metaphor is a useful way to think of a service-oriented architecture.

构造块是一种比喻说法，这对于我们理解面向服务的体系结构非常有帮助。

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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。

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