A resource that acts as a proxy for some subject; the topic map system's representation of that subject. The relationship between a topic and its subject is defined to be one of reification. Reification of a subject allows topic characteristics to be assigned to the topic that reifies it.
A short document which is written in such a way that it completely answers a single question. For example, an online help system typically consists of hundreds of topics, each describing a single procedure or concept.
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