I made a simple validator of wikipedia tag. It is fetching wikipedia articles and checking for serious problems. I intended to do some fancy checks - but for now even looking for articles without coordinates is enough. There are many instances of improper wikipedia tags in OSM database and multiple linked Wikipedia articles are missing coordinates.
Git repository with this python script resides at https://github.com/Bulwersator/OSM-wikipedia-tag-validator (suggestions for improvements, bug reports and especially pull requests are welcomed!), some example report (for Vatican and Manhattan) are at https://github.com/Bulwersator/OSM-wikipedia-tag-validator-reports . I may on request generate additional reports, for any location (the best way to ask for additional report is to open issue at https://github.com/Bulwersator/OSM-wikipedia-tag-validator-reports/issues ). Unfortunately this is standalone script, not a part of JOSM as I see no good way to integrate something fetching data from external sources (Wikipedia) into existing JOSM validator.
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