[OSM-talk] Duplicate ways in multipolygon relations

[Ed Loach]

Nev asked:

> is there a JOSM plugin to assist with duplicate ways?
> 
> We have been given explicit permission to use a good data set of
> shapefiles that define boundaries for the OSM.

<snip>

> I am a new user to QGis and wonder if the splitting and conflating of
> the shapefile to be merged can be done in QGis prior to introduction
> to JOSM and then would only need to sort out areas between
> adjacent relations.

Not sure about QGIS but have you looked at OGR2OSM?
https://wiki.openstreetmap.org/wiki/Ogr2osm

> Is it best not to bother doing this anyway or even preferable to leave
> all the polygons as individual entities with overlapping ways?

I'd say no to leaving them as individual entities with overlapping ways. 

Ed