[Tagging] Feature Proposal - RFC - artwork_subject=sheela-na-gig

[Martin Koppenhoefer]

Am Di., 8. März 2022 um 09:17 Uhr schrieb Mateusz Konieczny via Tagging <
tagging at openstreetmap.org>:

> Using both
>
> artwork_subject=sheela-na-gig
>
> and
>
> subject:wikidata=Q509424
> subject:wikipedia=en:Sheela na gig
>
> seems to be not needed for me.
>


this is (or should be) generally the case for all "...wikipedia" and
"...wikidata".
Our data should be self contained (not sure if this is the right term, I
mean that the semantics should be clear without having to use another
database in order to make sense of it).



> If artwork_subject=sheela-na-gig is used already then adding subject:*
> repeating this info to every single one seems to be not needed duplicate.
>


wikidata integration is generally useful to improve interoperability, but
it isn't a replacement for tagging in osm, as a result it will somehow
"duplicate" information in a certain sense.



>
> artwork_subject seems likely to be bunch of intersecting categories
> (and with artwork_subject=figurative already is)
>


yes, it is implicit that some tags have overlapping values, as there can be
more generic categories and more specific categories, where the latter are
completely or partially covered by the generic classes. For example it can
be seen in "building" as well (residential vs. apartments, house and
detached, etc.), in landuse (farmland vs. vineyard etc.), sculptures, ...
in this sense, artwork_subject=sheela-na-gig is probably a part of
artwork_subject=figurative (which is very broad (maybe too broad?) in
meaning)

There doesn't seem to be a conceived system behind the artwork_subject in
general https://taginfo.openstreetmap.org/keys/artwork_subject#values
the second most used value, "religious", has potential overlap with all the
other values (and could possibly be expressed with the standard religion=*
tag), although with some few it may be less likely (e.g. lgbtq). There are
only 3800 objects with this tag, and you cannot see yet where it may evolve
to. The documentation is a bunch of referrals to wikipedia, so that they
will change by the time without us noticing in the OSM-Wiki
https://wiki.openstreetmap.org/wiki/Key%3Aartwork_subject
>From the 5 documented values, figurative, religious, abstract, art_nouveau,
genre, the "art nouveau" value seems to be about style and not subject.
Some of the more used values are not in English, etc.
In this context, IMHO artwork_subject=sheela-na-gig is a better fit for the
key than most of the already used values.



>
> Maybe artwork:sheela-na-gig=yes would be better?
>
>

IMHO not. It would not provide context unless you knew what "sheela-na-gig"
was, better put it in the value.
If you wanted to use sheela-na-gig as a part of the key, why not
sheela-na-gig=yes?

Cheers,
Martin
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