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

[Warin]

On 3/10/22 22:01, Peter Elderson wrote:
> I would avoid "primary key", because that is a term from database 
> management systems. It means the identifying attribute (Id) of an 
> entity, usually a unique identifier with an index (primary index), 
> used to retrieve records and to link the entity (table) to other 
> tables. Something else entirely.
>
> Main key is better.
>
> Further: the main key gives the type of object, the main tag gives a 
> category within that type of object. That is an important difference, 
> in documentation.


semantics (nit picking) An OSM 'tag' is both a key and a value, example 
{{tag|colour|yellow}}. So it gives both 'object' and 'category'. Ok?

>
> Feature tag, I think it means the tag that gives the object type (the 
> main key)  and the category within the object type (the value). So, 
> equivalent to main tag.
> I think the term secondary tag(s) and secondary key(s) are often used 
> for the extra attributes of a feature, implying there should be a main 
> tag first, to give the secondary tags meaning.


If we use 'main key'/'main tag'  then secondary key/tag is logical.

>
> Peter Elderson
>
>
> Op ma 3 okt. 2022 om 12:40 schreef martianfreeloader 
> <martianfreeloader at posteo.net>:
>
>     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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