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Hierarchy doesn’t make sense if you care about multiple dimensions, which I often do with notes.

Sometimes I want to look at all notes relating to c++, sometimes everything related to a personal project. Directories don’t support that without symlinking everything that mentions c++ into a folder for that.

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Hierarchy can do that too, once you allow a single file to exist in multiple hierarchies at once. Think of database, we have a single table, yet we have a lot of different indexes to search on.

We could do the same, either with symlinks or hardlinks

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