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this feature would definitely need some thought, quite interesting.
Will relations between tags always be "is a", what about "status of", "in" etc?
Then probably labeling something as "Ubuntu" should automatically presume "Linux" and technically it should not be required to enter the whole sequence.
Will use of certain tags require use of some others? For example - if someone labels a post with "bug", should one be prompted to enter some label describing the context?
Are your users all highly technical or there are also casual users just dropping questions?