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<p>Actually building:buildyear is of much more widespread use than
building:start_date:</p>
<ul>
<li><a class="moz-txt-link-freetext" href="https://taginfo.openstreetmap.org/keys/?key=building%3Abuildyear">https://taginfo.openstreetmap.org/keys/?key=building%3Abuildyear</a>
-> 2051 objects</li>
<li><a class="moz-txt-link-freetext" href="https://taginfo.openstreetmap.org/keys/?key=building%3Astart_date">https://taginfo.openstreetmap.org/keys/?key=building%3Astart_date</a>
-> 163 objects</li>
</ul>
<p>that's a 12.6:1 proportion...</p>
<p>The key is documented in the IndoorOSM proposal [1] and in a wiki
page of which I fail to understand the meaning [2].<br>
</p>
<p>Sergio</p>
<p><br>
</p>
<p>[1]
<a class="moz-txt-link-freetext" href="https://wiki.openstreetmap.org/wiki/Proposed_features/IndoorOSM">https://wiki.openstreetmap.org/wiki/Proposed_features/IndoorOSM</a></p>
<p>[2] <a class="moz-txt-link-freetext" href="https://wiki.openstreetmap.org/wiki/Item:Q2952">https://wiki.openstreetmap.org/wiki/Item:Q2952</a><br>
</p>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 2019-02-16 10:39, Anton Klim wrote:<br>
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<blockquote type="cite"
cite="mid:0BFBE3D2-30D0-47CD-937E-0BEAB2138C6F@gmail.com">
<pre class="moz-quote-pre" wrap="">I believe there was an (failed? Undocumented?) attempt to make building:buildyear a thing, but haven’t seen it used for a while.
</pre>
</blockquote>
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