Michael wrote:
> This sounds quite promising, I will try it out. Basically I could
> leave
> the default unchanged and assign the desired ID to natural=land in the
> polygons style?

yes, but bare in mind that natural=land is also a common OSM tag.

If someone wants to render an island in a lake with natural=land and you render 
natural=land as background,
the island disappears under the lake. On the other hand, the opposite is also 
possible, when you have an island as natural=land and a lake on this island 
with natural=water. If you want to put natural=land above natural=water then 
the lake disappears.

This kind of tagging is obsolete, since it is more common now to use 
multipolygons to avoid those problems, so I think using a background polygon 
for natural=land should be fine.

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