[Tagging] Mapping cave tunnels passable by human

[Mateusz Konieczny]

I added to http://wiki.openstreetmap.org/wiki/Cave#Tagging_in_OSM how
these may be mapped ("tunnels that are available for humans but closed for
typical
tourists may be mapped as highway=path with tunnel=yes and access=private,
and routes available for tourists as highway=footway (highway=steps) with
tunnel=yes").

I think that it is an obvious idea, but wiki claimed that "At the moment
there just a
tag to map the entrance to a cave." despite fact that existing tags fit
well.

I am pretty sure that it is a good idea, but maybe there is some superior
scheme or
I missed something.

Example of cave tagged this way is available at
http://www.openstreetmap.org/?mlat=50.17416&mlon=19.80670#map=18/50.17416/19.80670

I wonder about adding something that would denote that way is part of cave,
maybe natural=cave_tunnel?
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