连贯是关联的一个派生概念，分为两类：命题内容的连贯和语境效果的连贯。
Coherence, derivable from relevance, is divided into two kinds: the coherence of propositional content and the coherence of contextual effect.
第六部分讨论了保证业务理论框架下的保证业务概念体系，并分别介绍了其中的核心概念和派生概念。
The sixth part introduces the Conceptual Systems of assurance service as a part of the theoretical frame, and displays the core concepts and some derivational concepts.
DITA包括三种从基本主题类型派生的信息类型：任务、概念和参考。
DITA includes three information types derived from the base topic type: task, concept, and reference.
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