Internal errors while generating a response

In the unlikely event of an internal error occurring while generating the response to an API call, an error element will be inserted. Further processing stops at this point.

Internal error explanation

Even though the HTTP return code is 200, and the response is syntactically correct, the message will be incomplete, and must be discarded by editing applications. For further analysis, editing applications should report an internal API error back to the user, along with the error message returned by the API call.

wayWithError_example.xml
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<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="CGImap 0.8.7 (26234 ubuntu)" copyright="OpenStreetMap and contributors" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/">
 <way id="4000392204" visible="true" version="1" changeset="1874689" timestamp="2022-07-26T20:56:27Z" user="mmd2" uid="1">
  <nd ref="5004686582"/>
  <nd ref="5004686236"/>
  <nd ref="5004686540"/>
  <nd ref="5004686705"/>
  <nd ref="5004686546"/>
  <nd ref="5004686468"/>
  <nd ref="5004686472"/>
  <tag k="bicycle" v="use_sidepath"/>
  <tag k="highway" v="secondary"/>
  <tag k="maxspeed" v="50"/>
  <tag k="name" v="Bunderstraat"/>
  <tag k="old_ref" v="N586"/>
  <tag k="surface" v="asphalt"/>
 </way>
 <error>Mismatch in tags key and value size</error>
</osm>