Thanks for the proposal, > I think we should consider having a hard rule of "A Wikidata item cannot be connected to more than one OSM item".
the 1:1 relationship is not so easy. What is your proposal for Monaco (Q235) ? https://www.wikidata.org/wiki/Q235 now: https://taginfo.openstreetmap.org/tags/wikidata=Q235#overview - 2 nodes - 3 relations Which OSM object will be the real "Monaco"? thanks, Imre Janko Mihelić <jan...@gmail.com> ezt írta (időpont: 2019. szept. 6., P, 15:08): > 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 > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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