overpassqueries.ql

[timeout:3600];
( area["ISO3166-1:alpha3"="DEU"];) ->.a;
        node["amenity"="parking"]
          (area.a);
         (._;>;);
 out body;



Only returns post_office amenities

[timeout:3600];
( area["ISO3166-1:alpha3"="DEU"];) ->.a;
        node["amenity"="post_box"]
          (area.a);
         (._;>;);

         node["amenity"="post_office"]
                   (area.a);
         (._;>;);
 out body;
 
 
 Returns both post boxes and post offices! This works!
 
 [timeout:3600];
( area["ISO3166-1:alpha3"="DEU"];) ->.a;
        (
                node["amenity"="post_box"]
                (area.a);

                node["amenity"="post_office"]
                (area.a);
        );
         (._;>;);
 out body;