Recently I’ve been working on some documentation in preparation of a house number import for Flanders. Mapping is more relaxing than this :-) The first version can be found on http://wiki.openstreetmap.org/wiki/AGIV_CRAB_Import A more extensive document, with more details for mappers is constructed under http://wiki.openstreetmap.org/wiki/WikiProject_Belgium/Using_AGIV_Crab_data

After the first feedback from the Belgian community, I’ll try to describe some more complex scenario’s for merging the data.