[Tagging] Mapping a negative

[Bryce Nesbitt]

I've run into a curious use of a tag, to map the /lack/ of a thing.
At least that's what I think mappers are doing.

One might normally expect a well, mountain hut, highway rest area, or 
toilet to offer drinking water. Some mappers have placed:
     drinking_water=no
To indicate the normal expectation is wrong.

I've attempted to document at:
http://wiki.openstreetmap.org/wiki/Key:drinking_water
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