RP: waterway=waterfall is generally only for points, but i think we can ignore that
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http://wiki.openstreetmap.org/wiki/Talk:Proposed_features/Waterfall
http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dwaterfall
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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]
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HB: mainland UPLOADED 2010-12-15 in changeset 6657794
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HB 22 Aug 2012: checked for new dataset, updated field names.