RP: waterway=waterfall is generally only for points, but i think we can ignore that
HB: waterway=waterfall seems to have gone out in of favour of natural=waterfall. For point nodes natural= seems better to me, for ways waterway= seems better to me. For polygons..?
Should we add tourism=attraction for named ones?? [no]
HB: mainland UPLOADED 2010-12-15 in changeset 6657794
HB 22 Aug 2012: checked for new dataset, updated field names.