zstadler 5657ede450 Add boundary=protected_area parks ...

Update the **class** of the **park* layer in a backward-compatible way.

The class for `boundary=protected_area` parks is the lower-case of the
[`protection_title`](http://wiki.openstreetmap.org/wiki/key:protection_title)
value with blanks replaced by `_`.
`national_park` is the class of `protection_title=National Park` and `boundary=national_park`.
`nature_reserve` is the class of `protection_title=Nature Reserve` and `leisure=nature_reserve`.
The class for other [`protection_title`](http://wiki.openstreetmap.org/wiki/key:protection_title)
values is similarly assigned.

Resolve https://github.com/openmaptiles/openmaptiles/issues/760

2020-01-27 11:12:57 +02:00

13 KiB

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