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

Jo winfixit at gmail.com
Sun Sep 8 18:38:28 UTC 2019

For what it's worth, I think your proposal makes sense.


On Sun, Sep 8, 2019 at 6:28 PM Janko Mihelić <janjko at gmail.com> wrote:

> Has no one any opinion on this? I have a feeling this is important for the
> future of the Openstreetmap - Wikidata relationship..
> Janko
> On Fri, Sep 6, 2019, 15:05 Janko Mihelić <janjko at gmail.com> wrote:
>> Last year there was a little discussion about unique wikidata ids in the
>> openstreetmap database:
>> https://lists.openstreetmap.org/pipermail/tagging/2018-August/038249.html
>> It was more or less decided there was no problem with this. Nevertheless,
>> I think we should consider having a hard rule of "*A Wikidata item
>> cannot be connected to more than one OSM item*".
>> Problems with not enforcing this rule:
>> - the problem of a partially downloaded database, where one is never sure
>> if a wikidata item is fully downloaded unless the whole database is
>> downloaded.
>> - we could get a flood of wikidata tags where one would, for example, tag
>> every building in a town with the wikidata id of the town, because that
>> building is a part of the town. Is that wrong tagging? Well, if the above
>> rule is not in place, I'm not sure.
>> - if a road segment has two road routes that are using it, then we should
>> tag it as "wikidata=Q1234;Q5678". That means, if we want to find any
>> wikidata id, we should be prepared to parse all wikidata tags and be
>> prepared for semicolons. This slows down any wikidata searches
>> - we can't enforce some rules like "tag leisure=stadium can only be
>> connected to something that is, or is derived from Q483110 (Stadium) in
>> Wikidata" because, if we tag all the parts of an entity, we can also tag a
>> water fountain in the stadium, because that is a part of it.
>> So I propose we enforce this rule, and we tag, for example, railways only
>> on the route relation.
>> If one wants to tag all route segments with a wikidata tag, I propose a
>> general usage "*part:wikidata=**" which would be used when a single
>> wikidata tag just isn't viable. Proposal wiki page here:
>> https://wiki.openstreetmap.org/wiki/Proposed_features/part:wikidata
>> Thanks for reading,
>> Janko Mihelić
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