I'm afraid that the main problem here is not the use "location" or "layer" or "cave" but "highway=path". This tag was created for multiple vehicles ways, not exclusive to a transportation like footways or cycleways. Currently the wiki tries to reflect this in the "path" definition:
"A route open to the public which is not intended for motor vehicles, unless so tagged separately. This includes snowmobile trails, ski trails, hiking trails, horse trails, bike trails and paths, mountain bike trails as well as combinations of the above and other modes of transportation. " Unfortunatelly, this tag was abusively (impov) reused later for climbing routes. And now for caving. But none of these activities are open to the main public, requires special skills and equipments (incl. for survey) and, as already mentionned, needs a better handling of elevation data which is not easy in our model. I'm afraid that the main reason to not create new "highway" tags was/is to see them immediately on the rendered maps... That's why I would prefer something new like "highway=cave" (or whatever you like) without any additional mandatory tags like "location=underground" (correct me if I'm wrong but a cave is always underground). That would not be immediately visible on the map but data consumers requesting "all highway path in Poland" could also safely ignore this creation. Pieren _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
