Why is zone ambiguous on a bus_stop ? Or any more ambiguous than "name" ? The latter is also used for so many different things.
I see no need to make new tags for each new "zone" concept. This is only needed when 1 item can belong to different types of zones. When you need 2 different zones for metro and regional networks you will probably also want to "group" the routes (and other information) that fall under each zone system. In that case your keys (public_transport_zone:ptv/vline) are also not sufficient. So you will end up with a relation of type zone in which all the public transport stops are grouped. Just my .5 cent m
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