Agree on the purpose of Wikidata but many OSM features (such as buildings) does not have a Wikidata item (only major buildings have one, usually landmarks).

I would rather say that as soon as an OSM item has a Wikidata attribute then a QA tool may suggest to move some other attributes in Wikidata where they would be better updated and served (start_date for instance). Otherwise those attributes would be fine if no Wikidata item is associated. The OSM wiki pages of such attributes (e.g. start_date) would suggest to put them in Wikidata if and only if an item already exists there.

Yours,

LeTopographeFou
Envoyé: 18 février 2019 9:43 PM
Répondre à: [email protected]
Objet: Re: [Tagging] start_date variants

On Tue, Feb 19, 2019 at 4:28 AM Richard <[email protected]> wrote:
It would also be interesting to be able to tag the start of construction - often construction starts many years before the building is finshed: Airport BER in Berlin, Germany or La Sagrada Familia in Barcelona, Spain are famous examples. How to tag this? Maybe: construction:start_date?

Any thoughts on this?

you could map what was there at any particular time but I think it is better to provide the link to Wikipedia. Ordinary users will ever look at OSM data close enough to find out this details.

+1 (but link to Wikidata instead of [or in addition to] Wikipedia)

Most OSM data users only care about what is located where. Very few OSM data users would be interested in historical information such as when a building, a basilica, or an airport began and finished its construction. The actual people who would be interested in such information would look elsewhere instead of OSM and I think Wikidata is an excellent place to document such rich types of information. For example, see the Wikidata item for the Sagrada Família: https://www.wikidata.org/wiki/Q48435

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