[Tagging] drinkable vs. drinking_water

[Ilari Kajaste]

On 13 July 2012 20:30, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
> 2012/7/13 Ilari Kajaste <ilari.kajaste at iki.fi>:
>> This isn't all that surprising. "drinkable" is an attribute,
>> "drinking_water" is a service. Different types of things are used in
>> different tagging contexts.
>
> please note that there are 2 kind of drinking_water: as a value
> (amenity=drinking_water) which is IMHO the service/feature, and as
> key, drinking_water=yes/no, which seems to be used as attribute like
> drinkable.

Interesting, good note, thanks. "amenity=drinking_water" is of course
always a service. As for others, I did a bit of digging around, and it
seems:

"drinkable=*" is used exclusively as an attribute of a water amenity
(mostly "=fountain" or "=drinking_water")

"drinking_water=*" on the other hand is used both

1) as an attribute (e.g. "amenity=fountain"+"driking_water=yes" or
"natural=spring"+"drinking_water=no")

2) as a further definition for "amenity=drinking_water" either as 2a)
quality attribute (e.g. "drinking_water=untreated") or as 2b) type
attribute ("drinking_water=rainwater_tank" or
"drinking_water=fountain")

3) as an additional service (e.g.
"amenity=toilets"+"drinking_water=yes" or
"tourism=alpine_hut"+"drinking_water=yes" or
"amenity=bench"+"drinking_water=yes")

I didn't know a good tool to make a quantitative look at this, so this
is intended only as qualitative difference in cases of how the tags
are used in at least some cases.

-- 
    - Ilari Kajaste -

E-Mail: ilari.kajaste at iki.fi
WWW: http://iki.fi/ilari.kajaste