<p>Take the example in <a href="https://github.com/openstreetmap/iD/issues/3208#issuecomment-281942743" class="issue-link js-issue-link" data-url="https://github.com/openstreetmap/iD/issues/3208" data-id="163113498" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">openstreetmap/iD#3208 (comment)</a></p>
<p>If you took that diff you'd end up with an osmChange for the changeset of</p>
<div class="highlight highlight-text-xml"><pre><<span class="pl-ent">osmChange</span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0.6<span class="pl-pds">"</span></span> <span class="pl-e">generator</span>=<span class="pl-s"><span class="pl-pds">"</span>iD<span class="pl-pds">"</span></span>>
<<span class="pl-ent">create</span>>
<<span class="pl-ent">node</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> <span class="pl-e">lon</span>=<span class="pl-s"><span class="pl-pds">"</span>11.625506992810122<span class="pl-pds">"</span></span> <span class="pl-e">lat</span>=<span class="pl-s"><span class="pl-pds">"</span>46.866699181636555<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span>>
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>highway<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>bus_stop<span class="pl-pds">"</span></span> />
</<span class="pl-ent">node</span>>
<<span class="pl-ent">node</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>2<span class="pl-pds">"</span></span> <span class="pl-e">lon</span>=<span class="pl-s"><span class="pl-pds">"</span>11.62686047585252<span class="pl-pds">"</span></span> <span class="pl-e">lat</span>=<span class="pl-s"><span class="pl-pds">"</span>46.86730122861715<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span>>
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>highway<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>bus_stop<span class="pl-pds">"</span></span> />
</<span class="pl-ent">node</span>>
<<span class="pl-ent">relation</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span>>
<<span class="pl-ent">member</span> <span class="pl-e">type</span>=<span class="pl-s"><span class="pl-pds">"</span>node<span class="pl-pds">"</span></span> <span class="pl-e">role</span>=<span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>type<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>route<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>name<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>AtoB<span class="pl-pds">"</span></span> />
</<span class="pl-ent">relation</span>>
<<span class="pl-ent">relation</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>2<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span>>
<<span class="pl-ent">member</span> <span class="pl-e">type</span>=<span class="pl-s"><span class="pl-pds">"</span>relation<span class="pl-pds">"</span></span> <span class="pl-e">role</span>=<span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> />
<<span class="pl-ent">member</span> <span class="pl-e">type</span>=<span class="pl-s"><span class="pl-pds">"</span>relation<span class="pl-pds">"</span></span> <span class="pl-e">role</span>=<span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>type<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>route_master<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>name<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>master<span class="pl-pds">"</span></span> />
</<span class="pl-ent">relation</span>>
<<span class="pl-ent">relation</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>0<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>3<span class="pl-pds">"</span></span>>
<<span class="pl-ent">member</span> <span class="pl-e">type</span>=<span class="pl-s"><span class="pl-pds">"</span>node<span class="pl-pds">"</span></span> <span class="pl-e">role</span>=<span class="pl-s"><span class="pl-pds">"</span><span class="pl-pds">"</span></span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>2<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>type<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>route<span class="pl-pds">"</span></span> />
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>name<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>BtoA<span class="pl-pds">"</span></span> />
</<span class="pl-ent">relation</span>>
</<span class="pl-ent">create</span>>
</<span class="pl-ent">osmChange</span>></pre></div>
<p>If you process this all at once, all the references are there, but if you split it up between the relation 2 and 3 creates you get two diffs, the first of which references relations that don't exist.</p>
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