<div style="display: flex; flex-wrap: wrap; white-space: pre-wrap; align-items: center; "><img height="20" width="20" style="border-radius:50%; margin-right: 4px;" decoding="async" src="https://avatars.githubusercontent.com/u/5842757?s=20&v=4" /><strong>mmd-osm</strong> left a comment <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5973#issuecomment-2847964730">(openstreetmap/openstreetmap-website#5973)</a></div>
<blockquote>
<blockquote>
<p dir="auto">Changefiles today are usually sorted by (OSM type, OSM id, version). This ensures that most(*) dependent changes are already available, when reading an object. Consumers may rely on that order.</p>
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<blockquote>
<p dir="auto">I think we can keep the sorting of objects (per action) as is, regardless of the output format (ie. for the changeset download case).</p>
</blockquote>
<p dir="auto">Ok, I guess my comment was a bit premature. This happens when commenting on a mobile without checking the actual implementation...</p>
<p dir="auto">Sorting today is based on timestamp, object version, type (node/way/rel), and object id (<a href="https://github.com/zerebubuth/openstreetmap-cgimap/blob/v2.0.1/src/osmchange_responder.cpp#L32-L62">souce</a>). The action itself doesn't matter. It will be determined for each single element (<a href="https://github.com/zerebubuth/openstreetmap-cgimap/blob/v2.0.1/src/osmchange_responder.cpp#L188-L207">source</a>).</p>
<p dir="auto">As can be seen in the following examples, the current sorting wouldn't work anymore and re-grouping by action would be mandatory for the proposed JSON format in this PR. API clients would definitely see a fairly different sorting in this case.</p>
<ul dir="auto">
<li><a href="https://www.openstreetmap.org/api/0.6/changeset/52067542/download" rel="nofollow">https://www.openstreetmap.org/api/0.6/changeset/52067542/download</a></li>
<li><a href="https://www.openstreetmap.org/api/0.6/changeset/52067546/download" rel="nofollow">https://www.openstreetmap.org/api/0.6/changeset/52067546/download</a></li>
<li><a href="https://www.openstreetmap.org/api/0.6/changeset/52067549/download" rel="nofollow">https://www.openstreetmap.org/api/0.6/changeset/52067549/download</a></li>
</ul>
<p dir="auto">I think, my original proposal in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2317198063" data-permission-text="Title is private" data-url="https://github.com/zerebubuth/openstreetmap-cgimap/issues/407" data-hovercard-type="pull_request" data-hovercard-url="/zerebubuth/openstreetmap-cgimap/pull/407/hovercard" href="https://github.com/zerebubuth/openstreetmap-cgimap/pull/407">zerebubuth/openstreetmap-cgimap#407</a> would avoid this issue. Iit  uses the exact same sorting as today without a need to regroup the data.</p>

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