OK, Thanks for your answers. I understand that some of you consider postal code as redundant information in Belgium. Maybe it is... but I'm not 100% convinced ;-) When I use OSM as a database with Overpass Turbo, I like to receive postal code as a variable and display it without having to calculate it (maybe there's another way to do this ?).
Whatever, I think I'll focus on something more useful for the community, like finding automatically incorrect streetnames (in Brussels, I often find streetnames only in french or dutch in node or ways attributes, or misspellings). I'll work on this and prepare a special page for these findings... Bruno PS: I hope this answer will be associated with the correct thread... This is my first answer in the mailing-list and I'm definitely not a geek :)
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