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Also known as: hierarchy
The tree structure encoded in group names, read left to right from broadest to narrowest: rec.arts.movies.reviews sits under rec, then arts, then movies. The leftmost component names the hierarchy and determines who administers it, what procedure creates groups within it, and frequently whether a given server carries the branch at all. Servers subscribe to or drop whole hierarchies rather than managing groups one at a time.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.