If it was fitted with a shower .. then it becomes a shower.
If around the pipe on which the tap is present is fitted a fountain ..
then it becomes a fountain.
Nit picking: Oxygen is a gas .. under 'normal' conditions.
Better to use the term fluid rather than liquid.
I would expect the following to have taps are part of their
construction - as a OSM default - shower, bottle filler, drinking
fountain. If there is no tap .. then tap=no .. or better
flow=continuous. Why is flow=continuous better .. it says what it is.
Why would tap=yes be a good default?
I have run an overpass query to find all tagged types of drinking
fountains
("fountain"~"^(bubbler|drinking|nasone|drinking_fountain|toret|roman_wolf|wallace)$").
The total number of tagged items is 1572, 964 of which are in Italy (732
of which in Rome!!). In Italy this kind of fountains generally does not
have a tap.
Thus, the majority of fountains currently tagged in osm do not have a
tap; at this point it would be more sensible to have tap=no as a default.
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