Overpass-turbo.eu: can any body explan the admin_level !? I have runned various querys with a whole lot of results

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one question regarding [overpass-turbo.eu]


timeout:60];
area["name"="Mayenne"]->.boundaryarea;
way(area.boundaryarea)["building"="church"];
  foreach(
    node(w)->.n;                                     // determine all nodes of a way
    .n is_in->.a;
    area.a[name][boundary=administrative][admin_level~"^[2-8]$"] -> .a;
    out center;
    convert way ::=::,
              ::id = id(),
              is_in=a.set("{" + t["admin_level"] + ":" + t["name"] + "}");

    out;
  );

can any body explan the admin_level !? I have runned various querys with a whole lot of results

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/overpass-turbo-eu-can-any-body-explan-the-admin-level-i-have-runned-various-querys-with-a-whole-lot-of-results/108815