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# Create a Hierarchical Category Structure

IDOL Server provides a single category, the root category, which you cannot delete or modify. The root category serves as a base for the hierarchical category structure that you create. You can create categories under the root category:

- from scratch

- from clusters

- from legacy topic sets

- by copying categories

- by generating a taxonomy

- from XML

All categories are stored on disk, and become available for querying only if they are indexed into the IDOL Server category index.

After you create categories, you can:

- train the categories

- retrain the categories

- move the categories

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