<div dir="auto"><div style="font-size:12.8px" dir="auto">My use case is (I want to think) simpler.</div><div style="font-size:12.8px" dir="auto"><br></div><div style="font-size:12.8px" dir="auto">Search for "incheon height" in <a href="http://epsg.org/" style="text-decoration-line:none;color:rgb(66,133,244)">epsg.org</a>: <a href="https://epsg.org/search/by-name?sessionkey=syx74l2mwn&searchedTerms=incheon+height" style="text-decoration-line:none;color:rgb(66,133,244)">https://epsg.org/search/by-name?sessionkey=syx74l2mwn&searchedTerms=incheon+height</a></div><div style="font-size:12.8px" dir="auto">You can see "KVD1964 height", that was called before (just a few days ago) "Incheon height" (now under Naming System "EPSG alias").</div><div style="font-size:12.8px" dir="auto">If PROJ is my access to EPSG db, I would like to be able to perform that search somehow. I do not mind if I have to iterate (once) the whole catalogue to create a map.</div><div style="font-size:12.8px" dir="auto"><br></div><div style="font-size:12.8px" dir="auto">Javier</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 22 Jul 2023, 10:35 Martin Desruisseaux, <<a href="mailto:martin.desruisseaux@geomatys.com">martin.desruisseaux@geomatys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Le 21/07/2023 à 18:48, Even Rouault a écrit :<br>
><br>
> I don't think EPSG extent short names qualify as identifiers. They <br>
> might be altered between EPSG releases. Only their EPSG code is a true <br>
> (ie unmutable) identifier.<br>
><br>
True, but this is true for CRS name as well, and nevertheless ISO 19111 <br>
defines the type of those names as MD_Identifier. I agree that this is a <br>
bit surprising. A possible rational is that MD_Identifier contains a <br>
`version` attribute. so while the identifier code alone is ambiguous and <br>
unstable, the (code, version) or (namespace, code, version) tuples are <br>
more stable.<br>
<br>
Martin<br>
<br>
<br>
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</blockquote></div>