概念：专门化主题和映射。

Concept: Specializing topics and maps.

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概念、任务和引用主题(reftopics)都可以看作是主题的专门化。

Concept, task, and reference topics can all be considered specializations of topic.

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为了避免混淆，这篇文章（以及伴随的专门化）用 主题（subject）标签表示与SKOS的概念相同的事情，概念（concept） 标签则采用 DITA 的含义。

To avoid confusion, this article (and the accompanying specialization) uses the subject label for the same thing as the SKOS concept, and uses the concept label in the DITA sense.

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比如，conceptref只能引用概念主题(包含专门化的主题)。

For instance, a conceptref refers only to concept topics (including specialized concepts).

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比如，conceptref只能引用概念主题(包含专门化的主题)。

For instance, a conceptref refers only to concept topics (including specialized concepts).

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