[Tagging] artificial cave, historic military shelter

[Richard]

On Fri, Sep 02, 2016 at 06:24:16PM +0200, Martin Koppenhoefer wrote:

> Besides this, in the first five years of that OSM wiki article there was no
> mention of artificial caves, it was only 2 years ago when LastGrape decided
> to put this sentence about man made caves onto this page, and it is not
> clear whether this is really the consensus of the community or just a not
> well thought through sentence he unilaterally put in.

it is not just this one sentence, it's also natural=cave_entrance which was 
for natural caves from the beginning (eg the 2007 proposal). Also, I would 
argue that "natural" implies natural and there have been enough informal 
proposals for man_made=shaft and similar.

Richard