For the moment the wiki only describes the tagging of protected heritage in the four Belgian regions that get the heritage=4 tag. In Flanders, Wallonia and Brussels, the heritage agencies also maintain a (more comprehensive) inventory of heritage next to a list of protected heritage items. (the situation in the German speaking region isn’t well known by me). For example in Wallonia, the heritage inventory lists 51,000 items, including 9,000 protected items.

This is a proposal to follow the practice of heritage agencies and assign a tag to all inventoried heritage objects: add a tag for heritage objects inventories: heritage=5 * This will make the heritage items included in an inventory identifiable and searchable. Until now not protected inventoried heritage in Belgium only get the tag historic=x as other “old” items. * A tag for items that are only in their inventory is already in use by OSM France and also Italy, Netherlands, Bulgaria, Hong Kong also have different types of the tag heritage. (In Belgium we use heritage=4 for protected heritage as some other countries but a lot of other countries use heritage=2 for protected heritage. The used number is specified per country). * The wiki now describes heritage as “Site/building/object registered by an official heritage organisation”.

In the last few years, there have been a number of changes at the heritage agencies in Flanders and Wallonia.

… See full entry