Thank you all for the many insightful replies to my question!
What I've learnt so far:
1) A feature is something in the physical world. This is well documented
in the wiki: https://wiki.openstreetmap.org/wiki/Features
2) There is no such thing as a "primary feature".
3) The terms "main key", "primary key" and "feature tag" are synonymous,
except for the tag/key distinction.
4) None of the above terms is official OSM terminology.
5) None of these terms is well documented in the wiki.
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It looks like a couple of things would be good to get done:
A) We should get rid of the term "primary feature" in the wiki page
https://wiki.openstreetmap.org/wiki/Map_features
B) It would be useful if we agree on *one* official term for "main key",
"primary key" or "feature tag". (I think "primary key/tag" is the most
popular one)
C) We should document what we mean by this.
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Open questions:
Q1) Which term should we choose as official term? ("main key"/"primary
key"/"feature tag")
Q2) Should one OSM object hold multiple "primary tags"? (ongoing
discussion between Mateusz, Martin, Warin, Marc et al.)
On 03/10/2022 12:16, Marc_marc wrote:
Le 03.10.22 à 10:47, Mateusz Konieczny via Tagging a écrit :
there are cases where road is going in stream bed
imho only one main feature/objet : the stream bed
and car use it, a bit like a bicycle uses a road.
but we don't really have a secondary tag to say that
the stream bed is usable by a car... so we end up
describing this secondary use with a 2nd main tag...
this is not perfect
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