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

[Martin Koppenhoefer]

Am Mo., 3. Okt. 2022 um 10:17 Uhr schrieb Warin <61sundowner at gmail.com>:

>
> what about cases where multiple features are tagged on one object?
>
> For example stream + road tagged on one line?
>
>
> 2 primary features, identified by feature tags, represented by one
> OpenStreetMap element. Main key for stream is waterway, for road it is
> highway. In the osm2pgsql standard style, both are primary keys.
>
>
>
> The guide says 'one feature = one OSM entry'. I would try to map each
> feature as one entry (node/way/what ever).
>


I know this, but it is somehow arbitrary, because it is us who define the
tags and decides their meaning, hence we define what a feature is.
Example river + highway, it could be 2 objects, a highway and a river, or
it could be a single object with a specific tag for a highway that is also
a river / runs in a dry/intermittent/frozen river bed.

Another example: cyleway=track. This means, 1 osm object represents 2
features, a road and a cycleway, or it could be seen as a road with a
cycleway (one feature, i.e. one element is right).

Cheers,
Martin
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