id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
9650	Validate building=no	naoliv	team	"I was seeing some building=no here in Brazil and then I saw that there are more than 11000 uses of it http://taginfo.openstreetmap.org/tags/building=no#overview

It seems that it's thanks to iD https://github.com/openstreetmap/iD/issues/2111

building=no is the same as not using a building key. I can't think a valid use for this nor it makes sense to me.

If you agree, JOSM could validate this:

{{{
#!rule
*[building = no] {
        throwWarning: tr(""{0} is unnecessary"", ""{0.tag}"");
        fixRemove: ""{0.key}"";
}
}}}
 "	enhancement	closed	normal	14.02	Core validator		fixed