Hi, An OSM element is normally made of one "physical" object tag and a number of tags describing the attributes of that object or of the other attributes (such as (fictitious example) building:tower:antenna:gsm=yes). This applies to areas and nodes. Some people prefer to tag the attributes to a node inside an area, like a shop on a node. If the node represents a particular place (part) inside the area, its object tag is simply that of the inside object, like a room, a reception desk, whatever. The problem arises when they want their node to represent the whole area. Supposing a building, they would tag a building=yes node inside a building=yes area and QAs would complain about finding one building inside another. Supposing that substituting another tag for building=yes would play havoc, what is or would be an additional attribute tag meaning "I am the same object as that of the area enclosing me", meaning that it's a duplicate, an alias, you call it, such as: building=yes [building:]enclosing_area_alias=yes
Cheers André.
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