You can have preferential ordering of tags, which, basically, gives you hierarchy. Or, put another way, the hierarchical file name can be seen as an ordered n-

You can have preferential ordering of tags, which, basically, gives you hierarchy. Or, put another way, the hierarchical file name can be seen as an ordered n-tuple of tags. Both approaches give you new ways to view, find and manipulate FS content. What about viewing all files which are sources (belong to "src" directory in any part of a path)? Something like that.