It seems not very consistent that the wiki suggests the tag "cave:ref" for the ref of the cave but "name" for the name of the cave.
http://wiki.openstreetmap.org/wiki/Tag:natural%3Dcave_entrance I would suggest "cave:name" for the name of the cave. This way you can tag the name of the cave entrance as "name" and the ref of it as "ref", while "cave:ref" and "cave:name" would be available for tagging the name and ref of the cave to which the entrance leads. Despite having been to a number of caves, I am not very familiar with how cave cadastres work (particularly, whether there are different ones of them), but I would expect to exist more than one of them, so it might make sense to have the name of the cadastre as well in the tag (not looking at the legal situation, depending on the license it might be forbidden to reproduce the content of a cave cadastre). Cheers, Martin
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