Hello,

About https://www.openstreetmap.org/relation/18646088

Is "Aire de jeu" an official name?  Looks like a description, which is useless as long as "leisure=playground" is set.

I don’t think a site relation is useful. Drawing a polygon with leisure=playground is enough.  If there are playground=* objects or paths inside it, they will be automatically understood as being part of this.  This is the basic principle of inheritance, because OSM is a geographical database.  Site relations are mostly necessary to join distant items.  Any reason for wanting a relation here?

Thanks.