[Tagging] Terminology primary feature, main tag, etc..

[martianfreeloader]

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.

-------

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.

------

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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