Hi,
> I've always hesitated between the period and the comma.
A **period**? That sounds like a very bad idea. It is the decimal separator, so
using it for anything else obviously must lead to major issues.
I use semi-colon as proposed in [1], it plays nicely with opening_hours and
such keys, and I cannot remember having seen anything else in the wild.
-nik
[1] https://wiki.openstreetmap.org/wiki/Multiple_values
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