id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
10717	Validator should give error for incorrect natural=coastline	zvenzzon	team	"A common error (with large consequences for a lot of renderers) is when user tries to add an island inside a lake and accidently mark this as natural=coastline

Real world examples: 

http://www.openstreetmap.org/way/299962163/history
http://www.openstreetmap.org/way/231539889/history
http://www.openstreetmap.org/way/286032824/history

Would it be possible for JOSM validator to prevent users from doing this mistake? Not sure about exact criteria...

For further questions or follow up, I can be contacted via PM here: http://www.openstreetmap.org/user/zvenzzon/
"	enhancement	closed	normal	16.06	Core validator	latest	fixed	validator coastline natural	Klumbumbus