[Tagging] "part:wikidata=*" tag proposal for multiple elements connected to the same wikidata id

[Paul Allen]

On Wed, 11 Sep 2019 at 14:31, Janko Mihelić <janjko at gmail.com> wrote:

> The rule I'm trying to implement, "A Wikidata item cannot be connected to
> more than one OSM item", might also be interpreted as a DRY rule. But I'm
> at least proposing part:wikidata, so we can have the benefits of DRY, as
> well as easiness of tagging WET tags.
>

I think we have different people understanding this in different ways (or
I'm misunderstanding
them).  So this is how I see it...

Firstly, we're talking about Wikipedia's wikidata, and objects are tagged
with wikidata=*.
We're not talking about the wikidata OSM's own wiki maintains.  I don't
think anybody has
confused the two so far, but at one point I wasn't sure until I re-read a
sentence.

Rule 1: We only tag terminal instantiations which are unique objects, not
categories.
It is appropriate to use wikidata=Q275 for the Forth Railway Bridge; it is
not appropriate
to use wikidata=Q8471277 (category railway bridges) for the Forth Railway
Bridge.
Nor is it appropriate to use wikidata=532 (category village) for a village
which does
not have its own unique wikidata reference.

Rule 2: "Lesser" objects goegraphically within an object that has a
wikidata entry do not
inherit that wikidata entry.  If the wikidata entry is for a particular
town then objects
within the town do not also get that wikidata tag.  My street is within the
town
of Cardigan but does not get the wikidata tag for Cardigan, nor does a lamp
post
on that street, nor does my house.  Two reasons: first, it would lead to a
massive
proliferation of tags; second, an article about Cardigan doesn't tell you
about my
house or the nearby lamp post.

Rule 3: If an object is a multipolygon relation containing several outers,
such as some
university campuses, then the relation itself gets the wikidata tag for
that university,
not the constituent polygons.

Rule 4: For city states it all depends on whether the wikidata item is for
the city,
the state, or the city state.  In this case I'd be willing to use the same
wikidata tag
for a city state on two different OSM objects (the city and the country),
but others will
disagree.

I'm guessing that of all the objections I'm going to get, most will be
about rule 3.  Because
I can see reasons to have it both ways.  So maybe it's not a rule, just a
suggestion.

Or maybe I'm missing the whole point of what you're trying to do.  Wouldn't
be the first
time.

-- 
Paul
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