L'attribut boundary=administrative est utilisé pour marquer les frontières administratives de tout niveau (sauf multi-pays), niveau qui sera précisé avec l'attribut admin_level=*. OSM Wiki
Membres : relation["boundary"="administrative"]["admin_level"="6"].
rel(5638803);map_to_area->.region;rel(area.region)[boundary=administrative][admin_level=6];rel(area.region)[boundary=local_authority];
ID5638803 Bagdad admin_level 5 boundary administrative capital 4 is_in:country_code IQ note حدود امانة بغداد place city source https://2.bp.blogspot.com/-5x3NgrZGFGU/WKSXR3Hy09I/AAAAAAAAAV4/muiu9mtvax8ixXcGpJCvV-PizibLmquVACLcB/s1600/%25D9%2585%25D8%25AD%25D9%2584%25D8%25A7%25D8%25AA%2B%25D8%25A8%25D8%25BA%25D8%25AF%25D8%25A7%25D8%25AF.jpg type relation wikidata Q1530