Discussion: Boundary ID format
The boundary ID produced by borderline should have the following format as a minimum:
LUX-0001
The first 3-letter code is the ISO 3166-1 alpha-3 code of the country, the second code is the number of the boundary within the country. Maybe we should add further information to the ID but I would argue that this information should go into the boundary database (e.g. the different ID_x and NAME_x values together with the information in OSM: admin_level and relation ID). However, I suggest to add a hyphen between LUX and 0001 so that readability is increased and further information can be added after another hyphen without having to define the number of digits for the number.