- kindergarten belongs only in school, the amenity tag should not be changed here
- the name should probably just be "De Ladder", but "Vrije Basisschool (VBS) De Ladder" is definitely too much. Based on the website, I'd use VBS De Ladder
- I don't see the added value of adding an official reference number (this is basically unmaintainable), but reg_ref is not the best choice I think. Better discuss on the Belgian fora what ref:* to invent for this.