Topic on Help talk:Extension:AdvancedSearch
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one confusing term people often use is "category tree". the categorytree extension is nice and useful, but really, there is nothing in wiki categories that stipulates a tree structure. i'm not talking about the fact that people use the ward "tree" when they really mean DAG ("directional acyclic graph"), but about the fact that it's not even a DAG: there is no reason to assume the category graph is acyclic. directed cycles can, and sometimes do exist in the category directional graph.
peace.
