Instead of labelling the city itself with capital=yes, consider adding
the city to the admin boundary with a role of "capital". Like that a
city can easily be capital of multiple administrative units (it might be
a national capital and a provincial capital at the same time) and it
stays distinct from the administrative centre.
A city cannot simply be a "capital" based on its own characteristics
like population or area. Being a capital is a role of a place in the
context of a territory, so putting this on the relation for the
territory seems the most logical place to me.
As the capital and administrative centre are mostly coincident, I would
suggest that adding the "capital" role would only be required for the
exceptional cases. If no capital is specified explicitly, I would assume
that the admin_centre also has that role.
//colin
On 2016-10-08 13:25, Joachim wrote:
> While editing capital=yes I came across capitals of non-independent
> countries which have their national border tagged with admin_level=2
> (I just did a browser site search in
> https://osm.wno-edv-service.de/boundaries/).
>
> Wikipedia was used to assemble the list
> (https://en.wikipedia.org/wiki/List_of_national_capitals_in_alphabetical_order)
>
> The countries fall into the categories:
> - Realm of New Zealand (only Tokelau)
> - British Overseas Territories with Bermudas, Gibraltar, Turks and
> Caicos Islands and others
> - Crown Dependencies with Isle of Man, Jersey and Guernsey (quite independent)
> - Danish Realm with Greenland and Faroe Islands
>
> The following are grouped below their respective states:
> - French overseas departments and territories
> - United States Territories
> - Australian External Territories
> - Kingdom of the Netherlands (Dutch Caribbean)
>
> Question: Are there any improvements possible, e.g. creating some of
> the constructs above and order the countries below?
>
> Question: Should capital=yes mirror admin_level=2 or should
> capital=yes be used for independent countries and capital=2 for the
> other?
>
> Regards Joachim
>
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