It is useful to determine the topic of a text in order to make further classifications. This topic acts as the conceptual essence of that text. What happens when two texts do have the same topic? Then it is possible to establish semantic networks between those topics. These semantic networks have the form of a conceptual hierarchy, and do not belong to any of the texts, but are external meta-indexes of those documents. These indexes act as a structured filter of the content of the documents.

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