<div dir="ltr"><div dir="ltr"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 19, 2019 at 4:28 AM Richard <<a href="mailto:ricoz.osm@gmail.com">ricoz.osm@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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?<br><br>Any thoughts on this?<br></blockquote>
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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.<br></blockquote><div><br></div><div>+1 (but link to Wikidata instead of [or in addition to] Wikipedia)<br></div><div><br></div><div>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 FamÃlia: <a href="https://www.wikidata.org/wiki/Q48435">https://www.wikidata.org/wiki/Q48435</a><br></div><div><br></div></div></div></div>