Martijn van Oosterhout wrote:
How to tag Schengen boundaries within EU? There should be some
difference between e.g. Polish eastern and western borders.
I'm guessing it should be the other way round. Countries have borders
and Schengen is a relation associating all the countries...
That way we won't accedently forget some of the borders in south
america, for example...
I'm not so sure we can model it is a relation between countries, unless
we have a way of excluding parts of some countries. In most Schengen
cases it's more of a philosophical issue than a practical one, as most
of the exclusions are places that don't have land boundaries with other
members, but there are a few that do, such as Büsingen. (Although I'm
not sure whether that is a permanent exclusion, or just temporary until
Switzerland implements).
It's also important to remember that it's not really an EU thing at all.
Some EU countries aren't members, and some non-EU countries are. The
most important of these if we're going to render borders differently is
Norway (Iceland is slightly different by virtue of being an island, and
Switzerland, although a signatory, hasn't implemented yet).
But if we're going to render borders differently between countries that
have a common travel area, we're going to need to do it for more than
Schengen, anyway.
Just adding an extra tag to the border way to say whether it's an open
border or a closed border seems much simpler than trying to model
relationships at a country level.
Tony
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