[out:xml][timeout:3600]; ( node(5916072169)['wikidata'='Q370305']; ); (._;>;); out meta qt;//['should use a secondary wikipedia tag - linking from wikipedia and wikidata tag to a vehicle model or class']
[out:xml][timeout:3600]; ( node(240090876)['wikidata'='Q31924019']['wikipedia'='de:Buchen (Odenwald)']; node(3497251273)['wikidata'='Q55260706']['wikipedia'='de:Ferdinandsdorf']; node(3497261401)['wikidata'='Q66738744']['wikipedia'='de:Ferdinandsdorf']; node(3561589531)['wikidata'='Q66768693']['wikipedia'='de:Rineck']; way(107996419)['wikidata'='Q66491015']['wikipedia'='de:Carl Schurz']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( node(11300393483)['information'='board']['wikidata'='Q111677690']; ); (._;>;); out meta qt;//['information board with wikidata tag, not subject:wikidata']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.