Primary Constructs

Topics

Topics are the main building blocks of topic maps. The word topic comes from the Greek word topos, which means both location and subject. A topic is a computer representation of a subject and may be applied to a set of locations. Each of these locations is a resource, called a topic occurrence. All occurrences of the same topic share the property of “being about” the subject represented by that topic. The subject of a topic is the primary characteristic of that topic, and the secondary characteristic resides in the topic occurrences. That subject can be expressed by pointing to a resource. Two cases are possible: either the resource itself constitutes the subject of the topic, or the resource merely indicates the subject. ...

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