Currently, the usage of “type” in key name is variable, there seems to be four ways to define the type:
End the key name with “_type”. Example: Tag:tourism=artwork (artwork_type=)
End the key name with “:type”. Example: Tag:man_made=tower (tower:type=*)
Don’t use anything. Example: Tag:historic=memorial (memorial=) (memorial:type= is also used, mainly for stolperstein)
Use the type key (not recommended)
Wouldn’t it be useful to choose one way to do it and stick to it?