By "categories" I mean folders or namespaces, e.g., "karig.net/page/Azarennya/nouns" vs. "karig.net/page/Japanese/nouns", where a link to "verbs" in the latter page would take you to "karig.net/page/Japanese/verbs".
It'd be nice to create paths of arbitrary depth on the fly, and to have each "parent" show up as a page listing its ancestors and its immediate children. Thus if you created a page "Emmegan/Azarennya/nouns/proper nouns", you'd have at least four pages -- "Emmegan", "Azarennya", "nouns", and "proper nouns" -- each with links to the others.
It would be elegant to implement this with folders, since this system mimics folders. (This implies that each article is a file in one of these folders. Of course multiple files spread out over many folders are slowest to search.)
