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I've always thought that that effort had value, even if it is a failure.

I think BeOS had something going right when BeFS was introduced with indexed extended attributes. Tagging and other metadata are exceedingly useful, so why isn't anyone working on a native tagging filesystem with indexed extended attributes? That would go a long way to making the likes of WinFS a reality.

Even more useful is if we find a way to standardize the communication of these additional metadata, to make the tags and attributes more portable.