<html><head><meta http-equiv="Content-Security-Policy" content="script-src 'self'; img-src * cid: data:;"><style id="outgoing-font-settings">#response_container_BBPPID{font-family: initial; font-size:initial; color: initial;}</style></head><body style="background-color: rgb(255, 255, 255); background-image: initial; line-height: initial;"><div id="response_container_BBPPID" style="outline:none;" dir="auto" contenteditable="false"> <div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;"> 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).</div><div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;"><br></div><div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">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.</div><div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;"><br></div><div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Yours,</div> <div name="BB10" id="response_div_spacer_BBPPID" dir="auto" style="width:100%;"> <br style="display:initial"></div> <div id="blackberry_signature_BBPPID" name="BB10" dir="auto"> <div id="_signaturePlaceholder_BBPPID" name="BB10" dir="auto">LeTopographeFou</div> </div></div><div id="_original_msg_header_BBPPID" dir="auto"> <table width="100%" style="background-color: white; border-spacing: 0px; display: table; outline: none;" contenteditable="false"><tbody><tr><td colspan="2" style="padding: initial; font-size: initial; text-align: initial; background-color: rgb(255, 255, 255);"> <div style="border-right: none; border-bottom: none; border-left: none; border-image: initial; border-top: 1pt solid rgb(181, 196, 223); padding: 3pt 0in 0in; font-family: Tahoma, "BB Alpha Sans", "Slate Pro"; font-size: 10pt;"> <div id="from"><b>De:</b> seav80@gmail.com</div><div id="sent"><b>Envoyé:</b> 18 février 2019 9:43 PM</div><div id="to"><b>À:</b> tagging@openstreetmap.org</div><div id="reply_to"><b>Répondre à:</b> tagging@openstreetmap.org</div><div id="subject"><b>Objet:</b> Re: [Tagging] start_date variants</div></div></td></tr></tbody></table> <br> </div><!--start of _originalContent --><div name="BB10" dir="auto" style="background-image: initial; line-height: initial; outline: none;" contenteditable="false"><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 Família: <a href="https://www.wikidata.org/wiki/Q48435">https://www.wikidata.org/wiki/Q48435</a><br></div><div><br></div></div></div></div>
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