Think of a hierachical tag structure/scenario. Currently it's not possible to model an "is a" hierachical relation between tag subclasses and their parents.
A good example are the browsers that are available for Android and the following tags for it:
browser ├── chrome-for-android ├── dolphin-browser ├── firefox ├── opera #virtual, doesn't really exist yet │ ├── opera-mini │ └── opera-mobile └── stock-browser
Currently I need to look for each of the available tags to get all results, i.e. the generic browser doesn't list every browser-relevant questions.
How should this be handled:
Should each subtag also be accompanied by its parent tags? (e.g. browser, opera, opera-mobile instead of only opera-mobile).
EDIT: I'm not suggesting to add an 'opera-browser' tag here, it's just to take the example to the extremes for better illustration only.