id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
10743	shp import: Shared borders represented as duplicated ways.	StefanB	Don-vip	"When importing .shp file into JOSM happens that the result has some shared borders that are represented as duplicated wasy

JOSM validator then reports;

warning: Ways with same position (much too many), when duplicated ways only differ in tags, eg a multipolygon inner border (no tag, just a member of multipolygon relation) overlaps with the same simple polygon (with a simple tag) (example: a meadow within a forest multipolygon) yellow in the picture below: 
image
fixable by reusing the simple tagged way also as a member of multipolygon relation

error: Duplicated ways (regular occurance) when both overlapping ways have the same tags, or no tags if they are both members of different relations. (example: outer/exclave meadow within a forest multipolygon or multi-level-multipolygons) red in the picture below:
image
fixable by reusing same way (the only one) in both relations

warning: Self-intersecting way (some) when it is drawn as such in .shp, probably unrelated
image
fixable by reordering nodes within way?


See https://github.com/pnorman/ogr2osm/issues/28 for graphic examples
"	defect	closed	normal		Plugin opendata		fixed	shapefile shp import