Would it be ok, if I added levels 6 and 8 to Wien as well? I have
found a wiki page about your boundaries [2], but I dont understand if
its on purpose.
No, the usual way is to give an area the highest admin_level (lowest
nuber) of all possibilities.
Eg: Berlin in Germany. It's city (al8), county (al6) and state (al4). so
it has only AL4.
Regards
walter
btw: Austria just removed those redundant AL of vienna last year.
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