Summarizing the problems of the top_up:<type>[:<brand>]=yes/no approach: - Some networks (like PayPoint) allow top-up more than one service (mobile phone, public transport, ...) - The scheme has a over-namespacing problem because both the second and the third subkeys could be values - The name "top_up" can be confused with drink refill and is unclear for people of countries where prepaid services are not widespread - Brand names are likely to use characters such as upper-case letters or non-ASCII characters that should be avoided in keys where possible
So, basing on these problems, we could change the proposal to: - prepaid_top_up=<type> -> to specify the type of services whose top-ups are sold (like mobile_phone, public_transport, energy, credit_card, ...) - prepaid_top_up:brand=<brand> -> for brand whose top-ups are sold (like Vodafone); this would follow the same rules of brand=* - prepaid_top_up:network=<network> -> for payment networks that allow to top up other services (like PayPoint); this would follow the rules of network=* Some usage examples would be: - "prepaid_top_up"="transport"+"prepaid_top_up:network"="Opal" -> https://wiki.openstreetmap.org/wiki/File:Opal_Card_Top_up_point.jpg - "prepaid_top_up"="mobile_phone"+"prepaid_top_up:brand"="Digicel;LIME" -> https://wiki.openstreetmap.org/wiki/File:Bridgetown_top-up.jpg This would address all the problems: - networks with multiple services can be tagged with "prepaid_top_up"="mobile_phone;public_transport"+"prepaid_top_up:network"="PayPoint" - the over-namespacing problem is gone - "prepaid_top_up" can't be misunderstood - brand names are now in the value field If there are no objections I will update the proposal page with these tags. PS: someone wrote that "if the amount is pre-paid, it is not a credit card". When talking of credit card I refer to prepaid (or "preloaded") credit cards (see https://en.wikipedia.org/wiki/Credit_card#Prepaid_cards and https://en.wikipedia.org/wiki/Prepayment_for_service ). Kind regards -- Daniele Santini http://www.dsantini.it
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