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    <div class="moz-cite-prefix">On 19/5/20 8:01 pm, European Water
      Project wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAK=tSVcNTEMCraeS2HQJfCdU5RHNHG2ybRMcMuajUe+AYG1m7g@mail.gmail.com">
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      <div dir="ltr">Thank you all for responding. I've commented in
        order
        <div><br>
        </div>
        <div>Dear François & Jo,</div>
        <div><br>
        </div>
        <div> There are 240,000 drinking fountains  nodes (with the two
          tag forms) tagged globally. Although, your suggestion seems a
          reasonable one, unless there is master plan for unique id
          maintenance, 
          I am loathe to adding ref tags which might end up being poorly
          maintained stale pollution. </div>
        <div><br>
        </div>
        <div>Dear Mateusz,</div>
        <div><br>
        </div>
        <div>If I understand correctly, I can query the database for
          historic data states.  For how long is the historic data
          maintained ? 
          Do all of the servers below have the historic data ? </div>
        <div><br>
        </div>
        <div>
          <div>'<a href="https://lz4.overpass-api.de/api/interpreter"
              target="_blank" moz-do-not-send="true">https://lz4.overpass-api.de/api/interpreter</a>'; <br>
            ' <a href="https://overpass-api.de/api/interpreter"
              target="_blank" moz-do-not-send="true">https://overpass-api.de/api/interpreter</a>';<br>
            '<a href="https://overpass.kumi.systems/api/interpreter"
              target="_blank" moz-do-not-send="true">https://overpass.kumi.systems/api/interpreter</a>';<br>
            '<a href="http://overpass.openstreetmap.fr/api/interpreter"
              target="_blank" moz-do-not-send="true">http://overpass.openstreetmap.fr/api/interpreter</a>';<br>
            '<a href="https://z.overpass-api.de/api/interpreter"
              target="_blank" moz-do-not-send="true">https://z.overpass-api.de/api/interpreter</a>';<br>
            '<a href="https://overpass.nchc.org.tw" target="_blank"
              moz-do-not-send="true">https://overpass.nchc.org.tw</a>';<br>
          </div>
          <div><br>
            <div>Dear Simon,</div>
            <div><br>
            </div>
            <div>What do you mean by <span style="color:rgb(0,0,0)"> "</span><span
                style="color:rgb(0,0,0)">+ version" ? Are you referring
                to a timestamp or a something else ?</span></div>
          </div>
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      </div>
    </blockquote>
    <p>The version number. <br>
    </p>
    <p>See
      <a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/way/173244595#map=18/-33.89163/151.27633">https://www.openstreetmap.org/way/173244595#map=18/-33.89163/151.27633</a></p>
    <p>Way 173244595 is presently version 13. Version 1 would be when it
      was first created. <br>
    </p>
    <blockquote type="cite"
cite="mid:CAK=tSVcNTEMCraeS2HQJfCdU5RHNHG2ybRMcMuajUe+AYG1m7g@mail.gmail.com">
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          <div>
            <div><span style="color:rgb(0,0,0)"><br>
              </span></div>
            <div><span style="color:rgb(0,0,0)">For ways, which I am
                only starting to look to consider, maybe I could look
                for objects with a similar geometric center for the
                replacement object. </span></div>
            <div><span style="color:rgb(0,0,0)"><br>
              </span></div>
            <div><font color="#000000">Best regards,</font></div>
            <div><font color="#000000"><br>
              </font></div>
            <div><font color="#000000">Stuart </font></div>
            <div><br>
            </div>
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      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Tue, 19 May 2020 at 11:41,
          Simon Poole <<a href="mailto:simon@poole.ch"
            target="_blank" moz-do-not-send="true">simon@poole.ch</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">
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            <p>It should be noted that (for Nodes) id + version is
              actually stable (Ways and Relations are more complicated).</p>
            <p>So if you have id + version, you can</p>
            <p>- check that it is the current version of the object (all
              fine and dandy)</p>
            <p>- check if there is a later (undeleted) version, check if
              it (depending on your criteria) is still the "same
              object", update version in your reference</p>
            <p>- if the last version is deleted or your criteria for it
              being the same object doesn't hold, search in the vicinity
              for a replacement object.</p>
            <p>Doing the same for Ways and Relations requires including
              a location reference of some kind as geometry changes are
              not reflected in the versions, but can work in principle
              the same.<br>
            </p>
            <p>Simon<br>
            </p>
            <div>Am 19.05.2020 um 09:43 schrieb European Water Project:<br>
            </div>
            <blockquote type="cite">
              <div dir="ltr">Dear All,
                <div>
                  <div><br>
                  </div>
                  <div>I am looking for a way to create permanent links
                     to specific objects (fountains and cafés) with
                    images within our application ... and I have a
                    couple of questions. <br>
                    <div><br>
                    </div>
                    <div>How quickly do OSM node and ways numbers mutate
                      ?  What percentage should I expect to change each
                      year.  If the percentage of ids mutates slowly
                      enough .. maybe this is still the best bad short
                      term option ? </div>
                    <div><br>
                    </div>
                    <div>I was pointed to this wiki : </div>
                    <div><a
                        href="https://wiki.openstreetmap.org/wiki/Permanent_ID"
                        target="_blank" moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/Permanent_ID</a>  </div>
                    <div><br>
                    </div>
                    <div>On the discussion page, it is mentioned that a
                      solution is being targeted for end 2020 . Will
                      there be a tool to translate actual osm node and
                      ways numbers to the new permalink ids. </div>
                    <div><br>
                    </div>
                    <div>Apparently Mangrove uses GEO URI to create
                      perma links towards objects. <a
                        href="https://en.wikipedia.org/wiki/Geo_URI_scheme"
                        target="_blank" moz-do-not-send="true">https://en.wikipedia.org/wiki/Geo_URI_scheme</a>.
                      How do they deal with node repositioning ?  I
                      could create a link name with first 5 latitude num
                      followed by first 5 longitude num... but as soon
                      as someone moves the node I would get a broken
                      link... </div>
                    <div><br>
                    </div>
                    <div>Thanks for your help and advice</div>
                    <div><br>
                    </div>
                    <div>Best regards,</div>
                    <div><br>
                    </div>
                    <div>Stuart </div>
                    <div><br>
                    </div>
                    <div><br>
                    </div>
                  </div>
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              <pre>_______________________________________________
Tagging mailing list
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</pre>
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          </div>
          _______________________________________________<br>
          Tagging mailing list<br>
          <a href="mailto:Tagging@openstreetmap.org" target="_blank"
            moz-do-not-send="true">Tagging@openstreetmap.org</a><br>
          <a href="https://lists.openstreetmap.org/listinfo/tagging"
            rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.openstreetmap.org/listinfo/tagging</a><br>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
Tagging mailing list
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<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a>
</pre>
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